domain: apis
2838 products, primary matches first, then adoption-weighted; health v2 shown.
| Product | Health v2 | Stars | Maturity |
|---|---|---|---|
| timekit-io/booking-js Booking.js is an embeddable JavaScript booking widget by Timekit that lets websites add appointment scheduling in minutes, powered by the T… | 23 | 2428 | active |
| lestrrat-go/jwx A comprehensive Go library implementing the full JOSE family of standards (JWA, JWE, JWK, JWS, JWT) for signing, verifying, encrypting, and… | 99 | 2416 | active |
| dotnet/Docker.DotNet Docker.DotNet is a fully asynchronous .NET (C#) client library for the Docker Remote API, letting applications interact programmatically wi… | 40 | 2414 | active |
| the-momentum/open-wearables Open Wearables is a self-hosted, MIT-licensed platform that unifies wearable health data from providers like Garmin, Whoop, Oura, Fitbit, S… | 83 | 2407 | active |
| apache/fineract Apache Fineract is an open-source, cloud-ready core banking platform written in Java, providing client management, loan and savings portfol… | 93 | 2405 | stable |
| panva/openid-client openid-client is a TypeScript library providing OAuth 2.0 and OpenID Connect client APIs for JavaScript runtimes including Node.js, Deno, b… | 99 | 2398 | stable |
| hapifhir/hapi-fhir HAPI FHIR is a complete open-source Java implementation of the HL7 FHIR standard for healthcare data interoperability, providing APIs for b… | 97 | 2390 | stable |
| SignalR/SignalR ASP.NET SignalR is a .NET library that makes it simple to add real-time web functionality to ASP.NET (System.Web/Katana) applications, lett… | 42 | 9402 | maintenance |
| crbnos/carbon Carbon is an open-core manufacturing operating system combining ERP, MES, and QMS functionality in a single web application built on Supaba… | 68 | 2379 | active |
| Rob--W/cors-anywhere CORS Anywhere is a Node.js reverse proxy that adds CORS headers to proxied requests, allowing browsers to make cross-origin requests to ser… | 32 | 9376 | maintenance |
| dingo/api Dingo API is a PHP package that provides tools for building RESTful APIs on top of the Laravel and Lumen frameworks. It offers content nego… | 23 | 9368 | maintenance |
| knowsuchagency/mcp2cli mcp2cli is a Python CLI tool that turns any MCP server, OpenAPI spec, or GraphQL endpoint into a command-line interface at runtime with zer… | 59 | 2370 | active |
| orhanerday/open-ai A community-maintained PHP SDK for accessing the OpenAI API, supporting GPT-3/GPT-4 chat completions, DALL-E image generation, and ChatGPT-… | 28 | 2366 | active |
| nelmio/NelmioApiDocBundle A Symfony bundle that generates OpenAPI/Swagger documentation for REST APIs from PHP 8 attributes and code analysis. It exposes interactive… | 94 | 2365 | active |
| countries/countries A Ruby gem providing country objects with data from ISO 3166 (countries and subdivisions), ISO 4217 (currencies), and E.164 (phone numbers)… | 78 | 2359 | active |
| Neoteroi/BlackSheep BlackSheep is a fast asynchronous ASGI web framework for Python, inspired by Flask and ASP.NET Core. It features built-in dependency inject… | 90 | 2358 | active |
| form-data/form-data A Node.js library for creating readable multipart/form-data streams, inspired by the XMLHttpRequest-2 FormData interface. It supports appen… | 71 | 2355 | stable |
| smithy-lang/smithy Smithy is a protocol-agnostic interface definition language (IDL) and a set of tools for modeling services as collections of resources, ope… | 98 | 2345 | stable |
| mirumee/ariadne Ariadne is a Python library for building GraphQL servers using a schema-first approach, where the API is defined in SDL and business logic … | 94 | 2343 | stable |
| hashicorp/go-retryablehttp A Go library providing an HTTP client wrapper around net/http with automatic retries and exponential backoff. It exposes a nearly identical… | 69 | 2343 | stable |
| ulule/limiter A dead-simple rate limiting middleware library for Go supporting HTTP, FastHTTP, and Gin. It uses a pluggable store approach with built-in … | 23 | 2343 | stable |
| OpenSea SDK The official TypeScript SDK for OpenSea, the largest NFT marketplace. It lets developers access the orderbook, create and fulfill listings … | 95 | 2337 | active |
| oschwald/geoip2-golang A Go library for reading MaxMind GeoIP2 and GeoLite2 databases to look up geolocation data for IP addresses. It is built on the maxminddb r… | 94 | 2332 | active |
| fruitbars/simple-one-api A single-binary Go gateway that unifies access to multiple LLM providers (Qianfan, iFlytek Spark, Tencent Hunyuan, MiniMax, DeepSeek, etc.)… | 91 | 2329 | active |
| ObjectMapper ObjectMapper is a Swift framework that converts model objects (classes and structs) to and from JSON using the Mappable protocol and the <-… | 23 | 9137 | maintenance |
| JSONAPI-Resources/jsonapi-resources JSONAPI::Resources (JR) is a Ruby gem that provides a resource-focused framework for building JSON:API compliant API servers on Rails 5.1+.… | 54 | 2324 | active |
| httpie/http-prompt HTTP Prompt is an interactive command-line HTTP client built on top of HTTPie and prompt_toolkit, featuring fuzzy autocomplete, syntax high… | 23 | 9108 | maintenance |
| gotd/td gotd/td is a full MTProto 2.0 Telegram API client library written in pure Go, supporting both user accounts and bots with generated binding… | 93 | 2318 | stable |
| formio/formio Form.io is an open-source form and data management platform that combines a drag-and-drop JSON-driven form builder with an auto-generated A… | 76 | 2312 | active |
| cloudflare/meet Cloudflare Meet (formerly Orange Meets) is a demo video-conferencing application built on Cloudflare Realtime SFU (Calls) with WebRTC. It s… | 60 | 2312 | active |
| gotham-rs/gotham Gotham is a flexible web framework for Rust built on Tokio and Hyper, emphasizing stability, safety, security, and speed. It is statically … | 87 | 2309 | active |
| google/gnostic gnostic is a Go command-line compiler that converts OpenAPI descriptions between JSON/YAML and Protocol Buffer representations. It provides… | 66 | 2298 | active |
| josephburnett/jd jd is a command-line utility and Go library for diffing and patching JSON and YAML values. It supports a native human-readable diff format … | 80 | 2297 | active |
| Azure/azure-sdk-for-js The official Azure SDK for JavaScript and TypeScript, providing client libraries for consuming Azure services and management libraries for … | 95 | 2294 | active |
| edgurgel/httpoison HTTPoison is an HTTP client library for Elixir built on top of the Erlang hackney HTTP library. It provides a simple, idiomatic API for mak… | 81 | 2290 | stable |
| easy-mock/easy-mock Easy Mock is a self-hostable persistent web service that generates mock API data quickly and provides a visual interface for defining and m… | 23 | 8962 | maintenance |
| API-Security/APIKit APIKit is a BurpSuite extension (Java plugin) that discovers, scans, and audits leaked API documentation such as GraphQL, OpenAPI/Swagger, … | 23 | 2286 | active |
| financial-datasets/mcp-server A Model Context Protocol (MCP) server that exposes the Financial Datasets stock market API to AI assistants like Claude Desktop. It provide… | 31 | 2282 | active |
| googleapis/google-api-python-client The official Python client library for Google's discovery-based APIs, providing simple and flexible access to many Google APIs with built-i… | 99 | 8914 | maintenance |
| twitter/finatra Finatra is a lightweight Scala framework for building fast, testable HTTP and Thrift services on top of TwitterServer and Finagle. It provi… | 39 | 2272 | stable |
| dart-frog-dev/dart_frog Dart Frog is a fast, minimalistic backend framework for Dart built on top of shelf and mason, inspired by tools like remix.run, next.js, an… | 89 | 2268 | active |
| kubernetes-client/javascript The official Kubernetes client library for JavaScript/TypeScript, usable from Node.js server-side code. It provides typed API clients for a… | 94 | 2267 | active |
| FormidableLabs/react-native-app-auth A React Native bridge around the native AppAuth-iOS and AppAuth-Android SDKs for communicating with OAuth 2.0 and OpenID Connect providers.… | 89 | 2254 | active |
| giraffe-fsharp/Giraffe Giraffe is a functional micro web framework for F# that runs on top of ASP.NET Core. Applications are composed of HttpHandler functions tha… | 86 | 2250 | active |
| EWSoftware/SHFB Sandcastle Help File Builder is a tool for generating help files for .NET class libraries, combining XML code comments with conceptual topi… | 83 | 2250 | active |
| jwadow/kiro-gateway A self-hosted proxy API gateway for the Kiro API (Amazon Q Developer / AWS CodeWhisperer) that exposes Claude and other models through Open… | 65 | 2241 | active |
| douglascrockford/JSON-js Douglas Crockford's original JSON library for JavaScript, providing JSON.stringify and JSON.parse via 2.js for environments lacking a built… | 32 | 8718 | maintenance |
| python-restx/flask-restx Flask-RESTX is a community-maintained fork of Flask-RESTPlus, a Flask extension for quickly building REST APIs with minimal setup. It provi… | 60 | 2235 | active |
| Airtable/airtable.js The official JavaScript client library for the Airtable REST API, usable in Node.js and browsers. It lets you read, create, update, and del… | 34 | 2225 | stable |
| Pusher Channels The official Pusher Channels JavaScript client library for subscribing to channels and receiving realtime events over WebSockets with HTTP … | 97 | 2220 | active |
| rebing/graphql-laravel A Laravel package providing code-first GraphQL integration built on webonyx/graphql-php. Schemas are defined in PHP classes with support fo… | 95 | 2220 | active |
| ross/requests-futures A small add-on for the Python requests library that returns concurrent.futures Futures instead of blocking Response objects, enabling async… | 75 | 2219 | stable |
| h2non/gock gock is a Go library for declarative HTTP traffic mocking that intercepts outgoing requests via http.RoundTripper and matches them against … | 23 | 2218 | stable |
| postalsys/emailengine EmailEngine is a self-hosted, source-available (not open-source) headless email client that exposes IMAP, SMTP, Gmail API, and Microsoft Gr… | 95 | 2217 | active |
| TommyLemon/APIAuto APIAuto is a web-based HTTP API tool combining machine-learning-powered no-code automated testing, code generation with static checks, and … | 84 | 2217 | active |
| AmoyLab/Unla Unla is a lightweight, configuration-driven MCP gateway written in Go that converts existing MCP servers and REST APIs into MCP-compliant e… | 84 | 2213 | active |
| aws/aws-sdk-cpp The official AWS SDK for C++, providing a modern C++11 interface to Amazon Web Services with low- and high-level clients. It is production-… | 77 | 2209 | stable |
| KnpLabs/php-github-api An object-oriented PHP wrapper for the GitHub REST (v3) and GraphQL (v4) APIs, built on PSR-18 HTTP clients via HTTPlug. It is extensively … | 87 | 2207 | stable |
| kittinan/spotify-github-profile A service that generates an SVG 'now playing' card showing your current Spotify playback for embedding in a GitHub profile README. It runs … | 74 | 2206 | active |
| karldoenitz/Tigo Tigo is an HTTP web framework written in Go with a Tornado-like API and better performance. It includes routing, middleware support, and co… | 70 | 2203 | active |
| rswag/rswag Rswag extends rspec-rails request specs with a Swagger-based DSL for describing and testing Rails API operations, then generates OpenAPI (S… | 73 | 2201 | active |
| NatLabRockies/api-umbrella API Umbrella is an open source API management platform that sits as a layer above existing web service APIs. It standardizes access control… | 67 | 2196 | active |
| unsplash/unsplash-js The official JavaScript/TypeScript wrapper for the Unsplash API, providing typed methods for searching and fetching free photos. It support… | 66 | 2193 | active |
| zeroc-ice/ice Ice (Internet Communications Engine) is a complete RPC framework for building networked applications, using the Slice IDL to generate clien… | 91 | 2191 | stable |
| dedoc/scramble Scramble is a Laravel package that automatically generates OpenAPI 3.1.0 (Swagger) API documentation from your codebase without requiring P… | 94 | 2190 | active |
| rxi/json.lua A tiny, pure-Lua JSON encoding and decoding library that works with Lua 5.1, 5.2, 5.3, and LuaJIT. It is a single ~280-line file with no de… | 23 | 2186 | stable |
| c-ares/c-ares c-ares is a modern asynchronous DNS (stub) resolver library written in C. It provides non-blocking DNS query interfaces that abstract the i… | 97 | 2182 | stable |
| levigross/grequests GRequests is a Go library that wraps net/http with a convenient, Python Requests-style API. It provides helpers for all HTTP verbs, JSON/XM… | 73 | 2182 | active |
| Meting Meting is a lightweight music API framework that provides a unified interface to multiple Chinese music platforms including NetEase Cloud M… | 66 | 2181 | active |
| ruby-oauth/oauth2 A Ruby gem implementing OAuth 2.0 and 2.1 client functionality, including OpenID Connect (OIDC) support. It handles token requests, grant t… | 97 | 2179 | active |
| ramnes/notion-sdk-py A Python client library for the official Notion API, mirroring the reference JavaScript SDK. It provides both synchronous and asynchronous … | 89 | 2177 | active |
| qicosmos/cinatra Cinatra is a cross-platform, header-only, high-performance HTTP framework written in modern C++20, supporting HTTP 1.0/1.1, SSL, and WebSoc… | 87 | 2176 | active |
| algesten/ureq ureq is a simple, safe, blocking HTTP client library for Rust with minimal dependencies and no unsafe code. It supports HTTPS via rustls or… | 77 | 2174 | stable |
| 6over3/bebop Bebop is a high-performance, typesafe binary serialization format with a schema language and code generator (bebopc) that produces optimize… | 67 | 2173 | active |
| matrix-org/matrix-js-sdk The official Matrix Client-Server SDK for JavaScript and TypeScript, maintained by Element and used in Element Web and Desktop. It lets app… | 99 | 2172 | stable |
| mahmoud/glom glom is a Python library and CLI for declaratively accessing, transforming, and restructuring nested data structures like dicts, lists, and… | 74 | 2163 | active |
| mistweaverco/kulala.nvim Kulala.nvim is a Neovim plugin providing a fully-featured HTTP, GraphQL, gRPC, and WebSocket client interface inside the editor. It support… | 86 | 2151 | active |
| RichardKnop/go-oauth2-server A standalone, specification-compliant OAuth 2.0 authorization server written in Go. It implements the standard grant types (authorization c… | 48 | 2148 | active |
| dotnetcore/WebApiClient WebApiClient is a declarative REST API client library for .NET where developers define HTTP clients by declaring C# interfaces. It supports… | 82 | 2136 | active |
| zerodytrash/TikTok-Live-Connector An unofficial Node.js library that connects to TikTok LIVE streams and delivers real-time events such as chat comments, gifts, likes, follo… | 74 | 2133 | active |
| line/line-bot-sdk-python The official LINE Messaging API SDK for Python, providing clients for sending messages and parsing webhook events. It lets developers build… | 96 | 2132 | active |
| ogen-go/ogen ogen is an OpenAPI v3 code generator for Go that produces statically typed client and server code from an OpenAPI specification. It generat… | 98 | 2131 | stable |
| pycontribs/jira A Python library that wraps the Jira REST API, supporting authentication methods like basic, token, OAuth, cookie, and Kerberos. It include… | 79 | 2128 | active |
| OpenVidu/openvidu OpenVidu is a self-hosted, open-source video conferencing platform and WebRTC SDK suite, built as a LiveKit fork with mediasoup as its SFU … | 91 | 2126 | active |
| apache/libcloud Apache Libcloud is a Python library that provides a unified API for interacting with more than 50 cloud service providers, hiding differenc… | 76 | 2124 | stable |
| krakenjs/zoid Zoid is a JavaScript toolkit for building cross-domain components that render as iframes or popups on a different domain while passing prop… | 75 | 2124 | active |
| apioo/fusio Fusio is a self-hosted, open-source API management platform and gateway written in PHP that turns databases, microservices, and custom logi… | 94 | 2114 | active |
| jmfernandes/robin_stocks A pure Python library wrapping the Robinhood, Gemini, and TD Ameritrade APIs for trading and account management. It supports trading stocks… | 53 | 2114 | active |
| mountebank-testing/mountebank Mountebank is an open-source service virtualization tool that creates over-the-wire test doubles for many protocols including HTTP, TCP, gR… | 84 | 2106 | active |
| vulcand/oxy Oxy is a Go library of HTTP middleware handlers that extend the standard net/http library with reverse proxying, load balancing, rate limit… | 74 | 2105 | active |
| grafana/beyla Grafana Beyla is an open-source, eBPF-based auto-instrumentation tool that captures RED metrics and trace spans for HTTP/S and gRPC service… | 93 | 2103 | active |
| h2o/picohttpparser PicoHTTPParser is a tiny, fast HTTP request/response parser written in C. It is stateless and allocation-free, setting pointers into the ca… | 66 | 2103 | stable |
| msgpack/msgpack-python MessagePack serializer implementation for Python, providing CPython bindings (with a pure-Python fallback for PyPy) to read and write the e… | 84 | 2101 | stable |
| pmxt-dev/pmxt PMXT is a unified API and SDK (Python and TypeScript) for prediction markets, modeled after CCXT, covering venues like Polymarket, Kalshi, … | 73 | 2101 | active |
| symfony/deprecation-contracts A minimal PHP package providing a single global `trigger_deprecation()` function and convention for emitting deprecation notices from libra… | 87 | 2099 | stable |
| anthropics/anthropic-sdk-typescript The official TypeScript/JavaScript SDK for accessing Anthropic's Claude language model APIs from server-side applications. It provides a ty… | 94 | 2096 | active |
| protostuff/protostuff Protostuff is a Java serialization library with built-in forward-backward compatibility (schema evolution) and validation, supporting plugg… | 29 | 2096 | active |
| onsip/SIP.js SIP.js is a JavaScript/TypeScript SIP signaling library for building WebRTC applications with audio/video calling, messaging, and presence.… | 62 | 2094 | active |
| dahall/Vanara Vanara is a set of .NET libraries providing P/Invoke declarations, interfaces, enums, and structures for many native Windows APIs, along wi… | 98 | 2092 | active |
| googleapis/google-cloud-java The official Google Cloud Client Library for Java, providing idiomatic Java clients for Google Cloud Platform services such as BigQuery, Cl… | 99 | 2090 | stable |