CATEGORY

No standard library 11,888 crates

Data as of 2026-07-25 (crates.io database dump, timestamp 2026-07-25T02:00:36Z). Source: crates.io · db-dump.tar.gz · methodology & corrections.

vmu-rt1170-fcbFlexSPI configuration block for NXP's VMU RT1170 Drone Control Board841MIT OR Apache-2.0 Embedded development Hardware support pinocchio-tknComplete Token toolkit for Pinocchio: SPL Token + Token-2022 with unified API, zero deps, zero allocs841MIT OR Apache-2.0 Cryptography::Cryptocurrencies No standard library dstify_deriveproc macro for dstify839MIT OR Apache-2.0 Data structures Memory management bilge-defmtA derive macro that implements defmt::Format for your bilge structs839MIT OR Apache-2.0 Embedded development No standard library struct_to_array_deriveDerive macro for struct_to_array838MIT OR Apache-2.0 Data structures No standard library triedA fast, compact double-array trie with `no_std` + `alloc` support. Fork of [yada](https://crates.io/crates/yada) providing…836Apache-2.0 Algorithms Data structures substdAn unstable replacement for std and core modules with a focus on speed over safety.836Apache-2.0 Development tools Hardware support belt-dwpPure Rust implementation of the Belt-DWP authenticated encryption algorithm (STB 34.101.31-2020)834MIT OR Apache-2.0 Cryptography No standard library pmsx003Rust interface for PMS X003 air quality sensors833MIT Embedded development Hardware support fluentbase-codecA framework to build smart contracts on the Fluent L2 as well as blockchains and verifiable compute environments that compile to…833MIT No standard library Virtualization premium-displayDevice drivers for different displays8320BSD OR MIT OR Apache-2.0 Embedded development Graphics libutils-consoleA simple generalized I/O interface830MIT Command-line interface Configuration ili9488-rsA platform agnostic driver to interface with the ILI9488 TFT LCD display830MIT OR Apache-2.0 Embedded development Hardware support premium-lineA fixed capacity String suitable for stack allocation and devices without allocator8270BSD OR MIT OR Apache-2.0 Embedded development No standard library nam-wasmer-compilerBase compiler abstraction for Wasmer WebAssembly runtime826MIT No standard library WebAssembly circularbufRust fixed size circular (ring) buffer825MIT OR Apache-2.0 Data structures No standard library magic-args-deriveDerive macros for magic-args.824MIT No standard library Rust patterns geoscience-uomUnits of measurement822Apache-2.0 OR MIT No standard library Science rdif-displayDriver Interface display definition.821MIT Embedded development No standard library bbqueue-heapA SPSC, lockless, no_std, thread safe, queue, based on BipBuffers820MIT OR Apache-2.0 Embedded development Memory management coroutine-stateInspect the state of a Future created by an async function.820MIT OR Apache-2.0 Asynchronous No standard library eth-igbIntel IGB Ethernet driver819MIT Embedded development No standard library bitreprTraits and derives for packing/unpacking values into bits819non-standard Compression Emulators resext-macroproc-macro for resext crate819MIT No standard library Rust patterns data-encoding-v3Development branch of data-encoding 3.0.0818MIT Encoding No standard library lesbarString types that must encode legible text.816MIT Data structures No standard library dilithia-coreDilithia blockchain primitives — types, post-quantum crypto (ML-DSA-65), wallet. Lightweight, no_std-friendly.816MIT OR Apache-2.0 Cryptography No standard library lindera-crfConditional Random Fields implemented in pure Rust.816MIT Algorithms No standard library glob-setA globset-compatible glob matcher -- `no_std`, no regex, built on glob-matcher815Apache-2.0 Filesystem No standard library dprint-configStrongly-typed configuration structs and JSON Schema for dprint formatter plugins (TypeScript, JSON, TOML, Markdown). Used by…814Apache-2.0 Development tools No standard library platform-castPlatform-specific safe cast.814MIT OR Apache-2.0 No standard library No standard library::No dynamic allocation mfsk-corePure-Rust WSJT-family decoders + synthesisers (FT8 FT4 FST4 WSPR JT9 JT65 Q65) behind a zero-cost Protocol trait. Host (rustfft)…810GPL-3.0-or-later Embedded development Encoding phytium-mci-hostPhytium MCI/FSDIF host controller backend for sdmmc-protocol (no_std, FIFO/IDMAC)809Apache-2.0 Embedded development Hardware support funcpermCycle-walking functional permutations on [0..n)808Apache-2.0 OR MIT Algorithms No standard library perfmodeFan/Performance Control for ASUS TUF Gaming laptops807GPL-3.0-only Accessibility Command line utilities bash-hashbash hash function (STB 34.101.77-2020)806MIT OR Apache-2.0 Cryptography No standard library ldc3114Driver crate for the TI LDC3114 inductance-to-digital converter805MIT OR Apache-2.0 Embedded development No standard library d-ary-heapGeneric d-ary heap priority queue supporting min/max via comparator, with O(1) item lookup for updates. Features configurable…805Apache-2.0 Algorithms Data structures rdf-writer-cottasA COTTAS file writer for RDF.rs knowledge graphs.803Unlicense Data structures No standard library poet-rhaiEmbedded scripting for Rust802MIT OR Apache-2.0 Embedded development No standard library test-numbat-codec-deriveMacro implementations of test-numbat-codec #[derive(NestedEncode, NestedDecode, TopEncode, TopDecode)]799GPL-3.0-only Cryptography::Cryptocurrencies Development tools pictorus-block-dataDeprecated block data definitions for maintaining compatibility with older versions of Pictorus.797non-standard Embedded development Hardware support rusty-hktHigher-kinded types for Rust797Apache-2.0 No standard library Rust patterns nalgebra-randv09General-purpose linear algebra library with transformations and statically-sized or dynamically-sized matrices.797Apache-2.0 Mathematics No standard library cache-rsA high-performance, memory-efficient cache implementation supporting multiple eviction policies including LRU, LFU, LFUDA, SLRU…796MIT Caching Concurrency kobe-filFilecoin wallet for Kobe796MIT OR Apache-2.0 Cryptography No standard library kobe-tronTron wallet for Kobe795MIT OR Apache-2.0 Cryptography No standard library ds18b20-2A Rust DS18B20 temperature sensor driver for [embedded-hal](https://github.com/rust-embedded/embedded-hal)793MIT/Apache-2.0 Embedded development Hardware support js-semverParser and evaluator for npm's flavor of Semantic Versioning793MIT-0 No standard library auto-defaultMacro that adds a default field value of `Default::default()` to fields that don't have one792MIT OR Apache-2.0 Development tools Development tools::Procedural macro helpers kobe-cosmosCosmos wallet for Kobe792MIT OR Apache-2.0 Cryptography No standard library discrete_pidA PID controller for robotics and discrete control systems791MIT Aerospace::Drones Embedded development kobe-sparkSpark (Bitcoin L2) wallet for Kobe791MIT OR Apache-2.0 Cryptography No standard library rdf-reader-rdfxmlAn RDF/XML file reader for RDF.rs knowledge graphs.791Unlicense Data structures No standard library snowv-gcmThe SNOW-V-GCM AEAD construction.789BSD-3-Clause Cryptography No standard library io-jmapJMAP client library for Rust787MIT OR Apache-2.0 API bindings Email unroll-liteUnroll loops in const contexts, declarative macro version.785MIT Development tools::Build Utils No standard library pcd8544-halA hardware abstraction layer for PCD8544 LCD controllers (mainly used in Nokia 5510 displays)783MIT OR Apache-2.0 Embedded development Hardware support sync-linux-no-libcA project aiming to reimplement some of the most basic Rust std::sync utilities on Linux without the use of libc783MIT Concurrency No standard library test-numbat-codecLightweight binary serializer/deserializer, written especially for Numbat smart contracts783GPL-3.0-only Cryptography::Cryptocurrencies Development tools smart_leds_animationsLibrary for building animations with smart LEDs783MIT OR Apache-2.0 Embedded development Hardware support tg-linkerLinker script generation utilities for rCore tutorial OS kernel.783GPL-3.0 Embedded development No standard library zencan-nodeLibrary for implementing an OPENCan node, primarily on an MCU783MPL-2.0 Embedded development No standard library one-wire-bus-2A Rust implementation of the 1-Wire protocol for embedded-hal782MIT/Apache-2.0 Embedded development Hardware support capped_collectionsCollections with compile-time set capacities.781MIT OR Apache-2.0 Data structures No standard library pso-vdfno_std Verifiable Delay Function: MinRoot over BLS12-381 with Wesolowski O(1) verify781MIT Cryptography No standard library kobe-tonTON wallet for Kobe780MIT OR Apache-2.0 Cryptography No standard library lis2de12Blocking and async driver for the LIS2DE12 accelerometer with I2C and SPI support780MIT OR Apache-2.0 Embedded development Hardware support orbinum-zk-coreCore Poseidon-based cryptographic primitives for Zero-Knowledge proofs in Orbinum Network780Apache-2.0 OR GPL-3.0-or-later Cryptography No standard library zynq7000-halHardware Abstraction Layer (HAL) for the Zynq7000 family of SoCs780MIT OR Apache-2.0 Embedded development Hardware support cvlr-soroban-macrosMacros for cvlr-soroban778MIT Development tools::Debugging Development tools::Testing test-numbat-wasmNumbat WebAssembly smart contract API778GPL-3.0-only Cryptography::Cryptocurrencies Development tools mctp-estackEmbedded MCTP stack777MIT OR Apache-2.0 Embedded development Hardware support io-m2dirM2dir client library for Rust776MIT OR Apache-2.0 Email Filesystem hopper-nativeHopper's sovereign raw backend for Solana. Zero-copy account access, direct syscall layer, CPI infrastructure, PDA helpers, and…776MIT OR Apache-2.0 Embedded development No standard library literatorEfficient conversion of iterators to human-readable strings775MIT No standard library mod_idiom`mod` and `use` idiom.775MIT OR Apache-2.0 No standard library theta-syncA high-performance no_std MPSC channel with full Tokio compatibility774MIT OR Apache-2.0 Asynchronous Concurrency animatoProfessional-grade, renderer-agnostic animation library for Rust. Zero mandatory dependencies. no_std-ready.774MIT OR Apache-2.0 Game development Graphics uefi-resetUEFI modules that reset the system when loaded773MIT Embedded development No standard library espforge_commonConfiguration model for espforge773MIT Embedded development Hardware support whippyunits-proc-macrosProcedural macros for whippyunits unit definitions and declarators772MIT OR Apache-2.0 Development tools No standard library rdf-writer-trigA TriG file writer for RDF.rs knowledge graphs.772Unlicense Data structures No standard library supply-chain-trust-crate-000006Raw FFI bindings to platform libraries like libc.770MIT OR Apache-2.0 External FFI bindings No standard library karpal-verifyExternal prover bridge and trust model for the Industrial Algebra ecosystem770Apache-2.0 No standard library Rust patterns lunarsA compact, WASM-ready spaceship — fueled by Rust-grade hyperdrive! Write scripts that orbit Lua in speed and dock seamlessly with…768MIT OR Apache-2.0 Embedded development No standard library complex-besselPure Rust implementation of complex Bessel functions (J, Y, I, K, H, Airy) based on Amos Algorithm 644767MIT OR Apache-2.0 Mathematics No standard library movable-refA tool for building movable self-referential types767MIT No standard library zynq7000-rtRun-time support for the Zynq7000 family of SoCs for running bare-metal applications765MIT OR Apache-2.0 Embedded development Hardware support yedad_commonShared types, constants, and utilities for Yedad network763AGPL-3.0 Cryptography Network programming openzl_sddl_deriveGenerate OpenZL SDDL definitions from Rust structs763MIT Compression Development tools enidA library to parse Encrypted Numeric Identifiers762MIT Data structures No standard library typed-skiSKI calculus evaluator in Rust compiled to WASM760MIT No standard library WebAssembly tuple-intoA trait providing a convenient way to convert tuples of convertible elements.759Apache-2.0 Development tools No standard library playdate-sys-mockRuntime mock for testing playdate-sys and dependent crates. Contains own bindings until it fully covers & implements the full…759MIT OR Apache-2.0 Development tools::Testing External FFI bindings no-panic-constFork of no-panic crate with const fn and const Trait support759MIT OR Apache-2.0 No standard library No standard library::No dynamic allocation orx-metaMeta structures such as statically typed queues of heterogeneous elements.757MIT OR Apache-2.0 Data structures No standard library dpp-rulesPure EU ESPR cross-field regulatory rules, shared by dpp-domain and the Wasm sector plugins755Apache-2.0 No standard library supply-chain-trust-crate-000019A JSON serialization file format753MIT OR Apache-2.0 Encoding No standard library osom_encoders_commonCommon utilities for osom_encoders_* projects.753MIT Compilers Encoding lokeyAn extensible keyboard firmware753Apache-2.0 OR MIT Embedded development No standard library hisi-cryptoCrypto provider contracts and portable backend for HiSilicon embedded Rust753MIT Cryptography Embedded development bq27441Blocking and async driver for the BQ27441 battery fuel gauge with I2C support752MIT OR Apache-2.0 Embedded development Hardware support omeletA lightweight, game-orented math library for Rust, including vectors, matrices, and quaternions.752MIT Game development Graphics pda-counterA minimal Solana smart contract using Anchor to demonstrate PDA-based counter logic.751MIT Cryptography::Cryptocurrencies No standard library tg-rcore-tutorial-games-syscallSystem call definitions and interfaces for tg-rcore tutorial games.750GPL-3.0 Embedded development No standard library u880A cycle-stepped MME U880 emulator749GPL-3.0-or-later Emulators No standard library supply-chain-trust-example-crate-000059Library for reading/writing numbers in big-endian and little-endian.749Unlicense OR MIT Encoding No standard library neorv32High-level bindings for NEORV32 HAL and library.749non-standard External FFI bindings No standard library reliakit-validateComposable validation traits and error types for Rust structs and values.749MIT Data structures No standard library rdif-inputDriver Interface input definition.748MIT Embedded development No standard library ctoptionA compile-time option whose discriminant is elevated to compile time.748MIT OR Apache-2.0 Data structures Memory management ax-plat-aarch64-qemu-virtImplementation of `axplat` hardware abstraction layer for QEMU ARM64 virtual machine.748Apache-2.0 Embedded development Hardware support hekate-cryptoHash abstraction for the Hekate ZK proving system: Blake3, SHA-256, SHA-3-256.748Apache-2.0 Cryptography No standard library ism330dhcx-rsPlatform-agnostic driver for the ISM330DHCX high-accuracy 3D accelerometer and gyroscope with ultra-low noise, smart FIFO,…747BSD-3-Clause Embedded development No standard library ax-plat-riscv64-qemu-virtImplementation of `axplat` hardware abstraction layer for QEMU RISC-V virt board.746Apache-2.0 Embedded development Hardware support test-numbat-wasm-nodeNumbat WebAssembly VM API wrapper745GPL-3.0-only Cryptography::Cryptocurrencies Development tools::FFI neorv32-rtNEORV32 runtime support for Rust.745non-standard Embedded development No standard library nanobitUltra-fast binary serialization with multi-format compression and zero-copy deserialization743Apache-2.0 Compression Data structures rdf-reader-jellyA Jelly file reader for RDF.rs knowledge graphs.743Unlicense Data structures No standard library rdf-writer-rdfxmlAn RDF/XML file writer for RDF.rs knowledge graphs.740Unlicense Data structures No standard library exomizerExomizer raw de-/crunching library736Zlib Compression No standard library struct_to_arrayConvert between homogeneous structs and fixed-size arrays736MIT OR Apache-2.0 Data structures No standard library base64-turboThe fastest memory-safe Base64 engine. Formally verified (Kani/MIRI). Features runtime AVX2/AVX512 detection, NEON acceleration,…736MIT OR Apache-2.0 Encoding Hardware support supply-chain-trust-crate-000020Extra iterator adaptors, iterator methods, free functions, and macros.734MIT OR Apache-2.0 Algorithms No standard library supply-chain-trust-crate-000025Random number generators and other randomness functionality.734MIT OR Apache-2.0 Algorithms No standard library flexcellA flexible cell that allows safe circumvention of double borrow issues.734MIT OR Apache-2.0 Data structures No standard library supply-chain-trust-example-crate-000067Pre-allocated storage for a uniform data type733MIT Data structures Memory management libutils-diffA bytearray diff731MIT Configuration Development tools ccarp_helperA helper crate for CCARP730GPL-2.0-or-later No standard library No standard library::No dynamic allocation supply-chain-trust-example-crate-000057Cross-platform cryptography-oriented low-level SIMD library.727MIT OR Apache-2.0 Cryptography No standard library rdf-reader-trigA TriG file reader for RDF.rs knowledge graphs.727Unlicense Data structures No standard library downgradeDowngrade a mutable reference to an immutable one.727MIT No standard library Rust patterns gd32f4pacDevice support crate for GD32F4 devices727MIT OR Apache-2.0 Embedded development No standard library supply-chain-trust-example-crate-000087Integer traits and functions726MIT OR Apache-2.0 Algorithms No standard library supply-chain-trust-example-crate-000100A library to generate and parse UUIDs.726Apache-2.0 OR MIT Data structures No standard library optfield-liteA macro to generate a new struct with fields wrapped in Option.726MIT Development tools::Procedural macro helpers No standard library axs5106lA no_std Rust driver for the AXS5106L capacitive touch controller726non-standard Embedded development No standard library rdf-reader-cottasA COTTAS file reader for RDF.rs knowledge graphs.726Unlicense Data structures No standard library rdf-writer-jellyA Jelly file writer for RDF.rs knowledge graphs.725Unlicense Data structures No standard library can-hal-rsHardware-agnostic traits for CAN bus communication724MIT OR Apache-2.0 Embedded development Hardware support int_likeA Rust macro for defining integer-backed opaque types safely723MIT Data structures No standard library hisi-crypto-ws63Fallible WS63 cipher/TRNG backend for hisi-crypto723MIT OR Apache-2.0 Cryptography Embedded development unchecked_wrapConvenient UncheckedSync/Send wrapper types722MIT Concurrency No standard library nostd-print#[no_std] print for Rust on Windows and Unix systems722MIT OR Apache-2.0 No standard library mlkem-rsml-kem (kyber) post-quantum key encapsulation, from scratch in pure rust, all three security levels, nist-kat verified722MIT OR Apache-2.0 Cryptography No standard library tracing-cloudchamberExtend tracing with an ffi via cxx to emit events and create spans in C++721MIT Asynchronous Development tools::Debugging rust-native-obfadvanced native obfuscation library for rust718MIT Development tools No standard library iaziFunctions and facilities for formatting strings718non-standard No standard library Value formatting noalloc-slip-rsA no-std SLIP (Serial Line Internet Protocol) encoder and decoder implementation.718Apache-2.0 No standard library supply-chain-trust-example-crate-000011Random number generators and other randomness functionality.715MIT OR Apache-2.0 Algorithms No standard library supply-chain-trust-example-crate-000075Pure Rust implementation of the SHA-2 hash function family including SHA-224, SHA-256, SHA-384, and SHA-512.715MIT OR Apache-2.0 Cryptography No standard library rdif-vsockDriver Interface vsock definition.715MIT Embedded development No standard library reliakit-backoffClock-agnostic retry backoff policies (exponential, linear, constant) with jitter helpers. no_std and zero-dependency.715MIT Algorithms No standard library supply-chain-trust-crate-000002A macro to generate structures which behave like bitflags.710MIT OR Apache-2.0 No standard library xoroshiro256-full⚡ **Fast**, 🧪 **deterministic**, and 🧰 **ergonomic** implementation of **xoroshiro256**** with **no bit waste**.710Apache-2.0 Algorithms No standard library supply-chain-trust-example-crate-000030Determine whether characters have the XID_Start or XID_Continue properties according to Unicode Standard Annex #31708(MIT OR Apache-2.0) AND Unicode-3.0 Development tools::Procedural macro helpers No standard library stratagemA trait library that enables state management and command execution with built-in undo support, inspired by the Command design…708MIT OR Apache-2.0 No standard library Rust patterns supply-chain-trust-crate-000003A Rust port of Google's SwissTable hash map708MIT OR Apache-2.0 Data structures No standard library calePath manipulation library with no_std support708non-standard No standard library sb-curve25519-dalekA pure-Rust implementation of group operations on ristretto255 and Curve25519707BSD-3-Clause Cryptography No standard library zenzopA faster fork of the Zopfli DEFLATE compressor with optional ECT-derived optimizations.706Apache-2.0 Compression No standard library whippyunitsA zero-cost, pure rust units-of-measure library for applied computation706MIT OR Apache-2.0 Development tools No standard library supply-chain-trust-crate-000011Random number generators and other randomness functionality.705MIT OR Apache-2.0 Algorithms No standard library supply-chain-trust-crate-000013A hash table with consistent order and fast iteration.705Apache-2.0 OR MIT Data structures No standard library command_coreA no_std flexible function interpreter using phf for compile-time command dispatch.704MIT Embedded development No standard library upc-aUPC-A (Universal Product Code) parser library.703Apache-2.0 OR MIT No standard library No standard library::No dynamic allocation ramdiskIn-memory ramdisk block device implementation.703MIT Embedded development No standard library supply-chain-trust-crate-000034A macro for declaring lazily evaluated statics in Rust.702MIT OR Apache-2.0 Memory management No standard library hekate-coreCore primitives for the Hekate ZK proving system.700Apache-2.0 Cryptography No standard library nexcore-chronoSovereign DateTime engine — UTC timestamps, calendar dates, durations with zero external dependencies699MIT OR Apache-2.0 Date and time No standard library supply-chain-trust-crate-000017A small cross-platform library for retrieving random data from system source698MIT OR Apache-2.0 No standard library Operating systems storage_dataEasily associate Storage values to variables and manage them without manually using the Web Storage API698non-standard Data structures No standard library float-polyfillsDrop-in no_std-compatible polyfills for various f32 and f64 methods.698MIT OR Apache-2.0 No standard library No standard library::No dynamic allocation slice-by-8HUD Software's Rust improved implementation of the Intel Slice-By-8 algorithm.698MIT Algorithms No standard library zclZigbee Cluster Library Definitions698MIT Embedded development No standard library klattKlatt Formant Speech Synthesis algorithms.698MIT OR Apache-2.0 Embedded development Multimedia::Audio ldappostaladdrLDAP postal address parsing (zero-copy) and escape / unescape utilities697MIT Encoding No standard library transmuxMPEG-2 TS → CMAF/fMP4 remux: typed ISOBMFF boxes, a samples-in init/media segment builder, Annex B ↔ length-prefixed NAL, and HLS…697MIT OR Apache-2.0 Multimedia::Video No standard library supply-chain-trust-example-crate-000040Date and time library. Fully interoperable with the standard library. Mostly compatible with #![no_std].696MIT OR Apache-2.0 Date and time No standard library sdmmc-driverSD/MMC driver traits and implementations696GPL-3.0-only Embedded development Hardware support cc-dataClosed-caption cc_data() carriage (CEA-608/708), per ETSI TS 101 154 Table B.9.695MIT OR Apache-2.0 Multimedia No standard library suicide-rsA super simple crate for printing an error message when something terrible goes wrong and nothing can be done to recover.694MIT No standard library Operating systems supply-chain-trust-crate-000012Random number generators and other randomness functionality.693MIT OR Apache-2.0 Algorithms No standard library gmcrypto-simdSIMD backends for gmcrypto-core — AVX2 (x86_64) and NEON (aarch64) packed bitsliced SM4 S-box, quarantined to keep…693Apache-2.0 Cryptography No standard library osal-rsOperating System Abstraction Layer for Rust with support for FreeRTOS and POSIX692LGPL-2.1-or-later Embedded development No standard library supply-chain-trust-crate-000016Fast integer primitive to string conversion691MIT OR Apache-2.0 No standard library No standard library::No dynamic allocation prnsA Rust implementation of the PRNS fast random-access pseudo-random number generator691AGPL-3.0 Algorithms No standard library karpal-verify-deriveDerive and attribute macros for Karpal verification obligation export690Apache-2.0 No standard library Rust patterns supply-chain-trust-example-crate-000012Random number generators and other randomness functionality.686MIT OR Apache-2.0 Algorithms No standard library supply-chain-trust-example-crate-000013A hash table with consistent order and fast iteration.685Apache-2.0 OR MIT Data structures No standard library light_bitmapA minimal, fixed-size bitmap library written in pure Rust.684MIT Data structures Embedded development ax-driver-displayCommon traits and types for graphics device drivers682Apache-2.0 Hardware support No standard library supply-chain-trust-example-crate-000009A generic serialization/deserialization framework682MIT OR Apache-2.0 Encoding No standard library rscryptoPure Rust Cryptography: RSA, Ed25519, X25519, SHA-2/3, BLAKE2/3, AES-GCM/GCM-SIV, X/ChaCha20-Poly1305, Argon2, HMAC/HKDF, CRC.…680MIT OR Apache-2.0 Algorithms Cryptography fast_randsNon-cryptographically, but quite fast, RNG implementations678MIT OR Apache-2.0 Embedded development No standard library grift_arenaA minimal no_std, no_alloc arena allocator with garbage collection for the Grift Scheme interpreter678MIT OR Apache-2.0 Embedded development Memory management poet_rhai_codegenProcedural macros support package for Rhai, a scripting language and engine for Rust678MIT OR Apache-2.0 Embedded development No standard library as_repr-deriveRust trait for constant `#[repr(T)]` conversions677Apache-2.0 OR BSL-1.0 OR MIT No standard library No standard library::No dynamic allocation io-smtpSMTP client library for Rust676MIT OR Apache-2.0 Email No standard library