All 305,250 crates, alphabetically

heatmapDeprecated. Use histogram crate directly106,831Apache-2.0 heatmap-parseA robust GPS track processor for creating frequency-based route heatmaps from GPX, FIT, and polyline data4,076MITScienceVisualization heatmap_svga package to make svg image heatmaps based on a list of dates842AGPL-3.0-only heatseekerA fast, robust, and portable fuzzy finder.10,369MIT heatshieldUnsafe code research project1,515BlueOak-1.0.0 heatshrinkA minimal implementation of the heatshrink compression algorithm for no_std environments7,505MIT OR Apache-2.0 heatshrink-binA minimal library implementing the heatshrink compression algorithm for no_std environments1,564ISCCompressionEmbedded development heatshrink-libA minimal library implementing the heatshrink compression algorithm for no_std environments3,011ISCCompressionEmbedded development heavenA web framework in the making1,585MIT heavensN-body GPU simulations with rendering12,531MIT heavy-pdf-parserExtract text from PDF files with support for multiple output formats41MIT OR Apache-2.0 heavy_artilleryHeavy artillery in rust3,758MIT heavy_duty_boolsA library for working with heavy-duty boolean values.3,763MIT heavykeeperHeavyKeeper is for finding Top-K elephant flows with high precision and low memory footprint.23,568MIT OR Apache-2.0AlgorithmsData structures heavyliA grahpics library (also with sound support)3,710non-standardGame developmentGame engines heavyli_engineA game engine based on 'OpenGL'.8,307MITGame developmentGame engines heavylogA `log` implementation for no-std targets.44BSD-3-ClauseDevelopment tools::DebuggingNo standard library hebbSpiking-neural-network substrate — pure-Rust, no I/O, embed-anywhere42Apache-2.0ScienceSimulation hebbcodeHebbCode — intelligent programming platform17Apache-2.0Command line utilities hebcalA hebcal.com REST API Client1,830MIT/Apache-2.0 hebiA dynamic scripting language7,746MIT OR Apache-2.0 hebi_deriveDerive macros for Hebi5,320MIT OR Apache-2.0 hebi_diagDiagnostics for Hebi3,421MIT OR Apache-2.0 hebi_spanSpans for Hebi2,735MIT OR Apache-2.0 hebi_syntaxSyntax for Hebi4,114MIT OR Apache-2.0 heboDistributed MQTT broker9,125AGPL-3.0-onlyConcurrencyNetwork programming hebo_codecPacket codec for MQTT protocol10,324Apache-2.0ConcurrencyNetwork programming hebrewHebrew alephbet primatives and parsing library for rust.2,204AGPL-3.0-only hebrew_accentsA library for finding, filtering, and displaying Hebrew accents, specifically focusing on the Tiberian accent system as…1,358MIT OR Apache-2.0Text processing hebrew_unicode_scriptA low-level library designed to ascertain whether a character belongs to the Hebrew Unicode script. It supports checks for…10,556MIT OR Apache-2.0Text processing hebrew_unicode_utilsSome functions for processing Hebrew unicode characters.6,375MIT OR Apache-2.0Text processing hebridesImplementations for the real numbers, complex numbers, and basic linear algebra13,488MIT hecaHebrew calendar utility27,692MITCommand line utilitiesDate and time heca-convert-libHebrew Calendar library.3,401MITDate and time heca-libHebrew Calendar library30,659MITDate and time hecateOpenStreetMap Inspired Data Storage Backend Focused on Performance and GeoJSON Interchange20,098MITDatabase interfaces hecate-assemblerThe assembler for the hecate vm3,292non-standard hecate-bfA brainfck to hasm compiler for the hecate vm1,865non-standard hecate-cliCommand line interface to the Hecate simulation code generator!759non-standard hecate-commonCommon data structures for the hecate vm3,489non-standard hecate-entityDatabase entities for the Hecate simulation code generator!670non-standard hecate-executorThe local / remote command executor for the Hecate simulation code generator!851non-standard hecate-libA library for generating simulation code from a mathematical problem description!1,024non-standard hecate-mcp-serverThe Model Context Protocol server for the Hecate simulation code generator!456non-standard hecate-migrationDatabase migrations for the Hecate simulation code generator!648non-standard hecate-packerThe packer for the hecate vm2,495non-standard hecate-symrsA pure rust symbolic computation library! Inspired by sympy.1,943non-standard hecate-turtleA turtle implementation based on hecate vm2,342non-standard hecate-vmThe main package for the hecate vm3,890non-standard heccHiding erasure-correcting codes (HECC) from MCP whitepaper23MITAlgorithmsCryptography heckheck is a case conversion library.1,112,205,165MIT OR Apache-2.0No standard library heck-but-macrosA proc macro wrapper around the heck crate, so that its casing functions can be applied to identifiers. Also contains a…35,935MIT OR Apache-2.0Development tools::Build UtilsRust patterns heck-string-clicommand-line tool to convert strings via "heck" crate1,037MIT OR Apache-2.0Command line utilitiesDevelopment tools heckcheckA heckin small test case generator92,426MIT OR Apache-2.0 heckdiffA 3-way merge tool for all the extension for file (not yet, my hope)4,460MIT heckel-diffImplementation Paul Heckel's algorithm23BSD-2-Clause heckerPretend you are a hacker or feel like one from Hollywood2,786non-standardCommand line utilities heckleSemi-joke case conversion library: Spongebob Case and Billy Mays Mode22MIT OR Apache-2.0 heckmvA basic case-conversion renaming CLI tool.2,712MIT hecoThe HarmonyOS app development CLI tool built for you and AI agents.18Apache-2.0Command line utilitiesDevelopment tools hecsA fast, minimal, and ergonomic entity-component-system library461,986MIT OR Apache-2.0Data structuresGame engines hecs-component-providerEasily define behavior for sets of components when using the hecs ECS library.5,457MITGame development hecs-component-provider-macrosInternal code for an extension to the hecs ECS library. Use https://crates.io/crates/hecs-component-provider in your code.6,165MIT hecs-hierarchyHierachy implementation for Hecs ECS47,601non-standard hecs-macrosProcedural macro definitions for hecs122,972Apache-2.0 hecs-scheduleProvides shedulable systems and parallel execution for hecs65,167non-standard hectorServe your application's source code at a /hector axum endpoint, embedded at compile time41AGPL-3.0-onlyDevelopment toolsWeb programming::HTTP server hector-buildBuild-script helper for hector: walks your source tree and produces a compile-time tar.gz archive116AGPL-3.0-onlyDevelopment toolsWeb programming::HTTP server hectorl_loggerA simple logger with colors2,800MIT hedManage your hosts file from the command line.3,820GPL-3.0-or-laterCommand line utilities hedateA Holocene/Human Era-aware (GNU) date-like utility for converting, formatting, and expressing dates in the Holocene/Human Era…31AGPL-3.0-or-later heddle-apiGenerated Rust types and gRPC bindings for the Heddle public API1,028Apache-2.0 heddle-cliAn AI-native version control system3,324Apache-2.0Development tools heddle-cli-sharedCLI-side utilities shared between Heddle's OSS cli crate and the closed heddle-client crate: user config, remote target…4,697Apache-2.0Development tools heddle-clientHeddle hosted-backend client: auth, support, presence, the gRPC client wrappers, and the global credential store.2,439Apache-2.0Development tools heddle-coreAn AI-native version control system248Apache-2.0Development tools heddle-cryptoAn AI-native version control system5,111Apache-2.0Development tools heddle-daemonHeddle local-mode gRPC daemon and service implementations3,394Apache-2.0Development tools heddle-devtoolsDeveloper tooling for the Heddle workspace300Apache-2.0Development tools heddle-formatAn AI-native version control system1,963Apache-2.0Development tools heddle-git-projectionGit projection engine: bidirectional conversion between Heddle state and Git repositories.87Apache-2.0Development tools heddle-grpcAn AI-native version control system7,052Apache-2.0Development tools heddle-ingestImport git history (commits, refs, reflogs) into a native Heddle repository with agent attribution and reasoning annotations.3,427Apache-2.0 heddle-mergeAn AI-native version control system1,636Apache-2.0Development tools heddle-mountAn AI-native version control system361Apache-2.0Development tools heddle-objectsAn AI-native version control system5,519Apache-2.0Development tools heddle-oplogAn AI-native version control system5,126Apache-2.0Development tools heddle-protoAn AI-native version control system3,348Apache-2.0Development tools heddle-refsAn AI-native version control system5,124Apache-2.0Development tools heddle-repoAn AI-native version control system5,058Apache-2.0Development tools heddle-reviewAn AI-native version control system3,269Apache-2.0Development tools heddle-runtime-bridgeSync→async runtime bridge for Heddle: worker thread + private Tokio runtime, safe to call from any caller flavor.269Apache-2.0Development tools heddle-schemaAn AI-native version control system1,788Apache-2.0Development tools heddle-semanticAn AI-native version control system4,829Apache-2.0Development tools heddle-state-reviewAn AI-native version control system4,690Apache-2.0Development tools heddle-wireAn AI-native version control system1,736Apache-2.0Development tools hedel-rsA Hierarchical Doubly Linked List.5,243GPL-3.0Data structures hederaThe SDK for interacting with Hedera Hashgraph.70,340Apache-2.0 hedera-protoProtobufs for the Hedera™ Hashgraph SDK37,541Apache-2.0 hedera-seraiLibrary for connecting to coin, tailored for Serai1,567AGPL-3.0-only hedera_rust_clientCommunity supported SDK for Hedera Blockchain1,601MIT OR Apache-2.0 hedera_rust_client_deriveDerive macros for hedera_rust_client crate2,310MIT OR Apache-2.0 hedgeAn index based half-edge mesh implementation.20,470MPL-2.0Data structuresGraphics hedge-amethystAn adapter for using hedge meshes in Amethyst.1,440MPL-2.0Data structuresGraphics hedge_rsA cluster membership library built on spindle-rs.14,253MIT hedgedA "Hedged Requests" implementation as described in "The Tail at Scale" paper5,977non-standard hedged-rpc-clientHigh-performance Solana RPC client with request hedging for tail latency elimination107MITAsynchronousNetwork programming hedgehog-rsA simple Rust library for interacting with the Posthog API.28,971non-standard hedlHEDL - Hierarchical Entity Data Language233Apache-2.0Data structuresEncoding hedl-c14nHEDL canonicalization and pretty-printing1,298Apache-2.0Data structuresEncoding hedl-cliHEDL command-line interface83Apache-2.0Data structuresEncoding hedl-coreCore parser and data model for HEDL (Hierarchical Entity Data Language)1,527Apache-2.0Data structuresEncoding hedl-csvHEDL to/from CSV conversion530Apache-2.0Data structuresEncoding hedl-ffiHEDL C ABI bindings60Apache-2.0Data structuresEncoding hedl-jsonHEDL to/from JSON conversion795Apache-2.0Data structuresEncoding hedl-lintHEDL linting and best practices validation716Apache-2.0Data structuresEncoding hedl-lspLanguage Server Protocol (LSP) implementation for HEDL60Apache-2.0Data structuresEncoding hedl-mcpModel Context Protocol (MCP) server for HEDL - AI/LLM integration64Apache-2.0Data structuresEncoding hedl-neo4jHEDL to/from Neo4j graph database conversion360Apache-2.0Data structuresEncoding hedl-parquetHEDL to/from Apache Parquet conversion458Apache-2.0Data structuresEncoding hedl-streamStreaming parser for HEDL - memory-efficient processing of large files265Apache-2.0Data structuresEncoding hedl-testShared test fixtures and utilities for HEDL format converters673Apache-2.0Data structuresEncoding hedl-toonHEDL to/from TOON (Token-Oriented Object Notation) conversion545Apache-2.0Data structuresEncoding hedl-wasmWebAssembly bindings for HEDL with TypeScript support61Apache-2.0Data structuresEncoding hedl-xmlHEDL to/from XML conversion524Apache-2.0Data structuresEncoding hedl-yamlHEDL to/from YAML conversion536Apache-2.0Data structuresEncoding hedosDiscover, install, and serve the local models already on your machine.55MIT hedos-gatewayThe hedos gateway: a loopback server speaking the OpenAI and Ollama wire formats.74MIT hedos-kernelThe hedos kernel: model records, registry, discovery, install planning, and resolution.90MIT hedos-runtimeThe hedos runtime: execution adapters, sidecar supervision, and the memory governor.81MIT hedraReserved crate name for Hedra.19Apache-2.0API bindings hedra-cliReserved crate name for the Hedra CLI.19Apache-2.0Command line utilities hedronAn all-in-one 3D modelling library2,859MITGame engines heduHex dumping tool written in Rust4,853GPL-3.0-or-later hedwigA simple message bus for Rust73,670Apache-2.0AsynchronousWeb programming hedwig_coreA simple message bus for Rust8,665Apache-2.0 heeczerIdiomatic Rust SDK for ai-heeczer — in-process scoring + HTTP client.19MIT heeczer-coreDeterministic, fixed-point scoring core for ai-heeczer (HEE/FEC analytics for agentic AI).53MITAlgorithmsScience heedA fully typed LMDB (mdb.master) wrapper with minimum overhead4,281,045MITData structuresDatabase interfaces heed-traitsThe traits used inside of the fully typed LMDB wrapper, heed4,214,209MIT heed-typesThe types used with the fully typed LMDB wrapper, heed4,245,502MIT heed3A fully typed LMDB (mdb.master3) wrapper with minimum overhead with support for encryption55,080MITData structuresDatabase interfaces heejae_crateSample Project2,999MIT heekkrheekkr spec3,193MIT heelCross-platform native sandboxing library for running untrusted code58MIT OR Apache-2.0Development toolsOperating systems heel-gunA tool for testing an HTTP server's robustness to arbitrary requests3,473Apache-2.0 OR MITCommand line utilitiesNetwork programming heeloA short description of my package4,577MIT OR Apache-2.0 heelonvault-coreCore cryptography and storage library for HeelonVault29Apache-2.0CryptographyDatabase interfaces heeranjidRust Snowflake-style distributed ID generator: 64-bit sortable bigint IDs and UUIDv8-compatible 128-bit IDs for Postgres and…1,144MIT OR Apache-2.0AlgorithmsData structures heeranjid-ffiC FFI bindings for HeeRanjID distributed ID generation151MIT OR Apache-2.0API bindings heeranjid-sqlxSQLx integration for HeeRanjID distributed ID generation199MIT OR Apache-2.0Database interfaces hefa-coreRust LLM foundation: provider abstraction, tools, structured output, tracing.40MIT hefestoDouble envelope encryption — AES-256-GCM + Argon2id for multi-tenant applications215MITCryptography hefesto-widgetsRatatui widgets for the Hefesto TUI toolkit: popups, scrollable lists, trees, text input and spinners402MITCommand-line interfaceGUI heftFast disk usage scanner with mtime tracking214MITCommand line utilitiesFilesystem heft-formatShared .heft file format library (cross-platform)204MIT heft-mftWindows MFT-based disk usage scanner that produces .heft files27MIT heftyParser for streaming data6,525MITParsing tools hegdeatri-utilMy utility crate1,511AGPL-3.0 hegelAWS HTTP API Gateway Payload for Lambda2,984MIT hegeltestProperty-based testing for Rust, built on Hypothesis110,865MITDevelopment tools::Testing hegeltest-cC shared library bindings for Hegel's native engine.33,386MIT hegeltest-macrosProcedural macros for Hegel.112,108MIT hegemonA modular system monitor3,960GPL-3.0-or-later hehA cross-platform terminal UI used for modifying file data in hex or ASCII.29,921MITCommand line utilitiesText editors heheA modular AI Agent framework in Rust25MIT OR Apache-2.0AsynchronousDevelopment tools hehe-agentAgent runtime for hehe AI Agent framework294MIT OR Apache-2.0Development tools hehe-cliCommand-line interface for hehe AI Agent framework24MIT OR Apache-2.0Command line utilities hehe-coreCore types, traits and utilities for hehe AI Agent framework632MIT OR Apache-2.0Development tools hehe-llmUnified LLM provider abstraction for hehe AI Agent framework384MIT OR Apache-2.0API bindings hehe-serverHTTP/WebSocket server for hehe AI Agent framework206MIT OR Apache-2.0Web programming::HTTP server hehe-storeUnified storage abstraction layer for hehe AI Agent framework24MIT OR Apache-2.0Database interfaces hehe-toolsTool system and built-in tools for hehe AI Agent framework384MIT OR Apache-2.0Development tools heicPure Rust HEIC/HEIF image decoder with SIMD acceleration7,487AGPL-3.0-only OR LicenseRef-Imazen-CommercialMultimedia::ImagesParser implementations heic-to-dynamic-gnome-wallpaperCLI tool to convert heic image containers used in MacOS's dynamic wallpapers to dynamic gnome xml wallpapers9,865GPL-3.0-onlyCommand line utilitiesMultimedia heidiA library to work with NHS numbers3,097MIT heifA HEIF file decoder and encoder written from scratch1,170MIT heif-rsEncode and decode HEIF/HEIC images with x265 and libde265, via statically-linked libheif.430Apache-2.0EncodingMultimedia::Images heif-syslibheif bindings4,239Apache-2.0 height-meshA small crate to generate a 3D mesh from a 2D heightmap.2,272MIT OR Apache-2.0 heightmap_to_stlConvert a heightmap to stl triangles.2,629GPL-3.0 heimCross-platform framework for system information516,065Apache-2.0 OR MITAPI bindingsAsynchronous heim-commonCommon stuff shared across heim project crates541,471Apache-2.0 OR MITAPI bindingsAsynchronous heim-cpuCross-platform CPU information456,664Apache-2.0 OR MITAPI bindingsAsynchronous heim-deriveDerive macros for heim crates81,651Apache-2.0 OR MITAPI bindingsAsynchronous heim-diskCross-platform disk information411,069Apache-2.0 OR MITAPI bindingsAsynchronous heim-hostCross-platform host information402,139Apache-2.0 OR MITAPI bindingsAsynchronous heim-memoryCross-platform memory information420,245Apache-2.0 OR MITAPI bindingsAsynchronous heim-metrics-proxyReserved for a future use1,846Apache-2.0 OR MIT heim-netCross-platform network information451,755Apache-2.0 OR MITAPI bindingsAsynchronous heim-processCross-platform processes information336,194Apache-2.0 OR MITAPI bindingsAsynchronous heim-runtimeRuntime shims for heim crate531,388Apache-2.0 OR MITAPI bindingsAsynchronous heim-sensorsCross-platform sensors information359,888Apache-2.0 OR MITAPI bindingsAsynchronous heim-virtCross-platform virtualization system detection227,254Apache-2.0 OR MITAPI bindingsAsynchronous heim-winservicePlaceholder crate1,904Apache-2.0 OR MIT heimdalUniversal dotfile and system configuration manager248MITCommand line utilitiesConfiguration heimdallServices monitor system using SMTP3,665GPL-3.0 heimdall-cliA simple hotkey daemon. Primarily tested on MacOS16,500MIT heimdall-coreCore Heimdall sandbox runtime orchestration and execution types.615MIT heimdall-linux-sandboxLinux sandbox backend for Heimdall using bubblewrap and namespaces.707MIT