function: api-framework
1878 products, primary matches first, then adoption-weighted; health v2 shown.
| Product | Health v2 | Stars | Maturity |
|---|---|---|---|
| hoppscotch/hoppscotch Hoppscotch is an open-source API development ecosystem for building, testing, and documenting HTTP, REST, GraphQL, and WebSocket requests. … | 98 | 80100 | active |
| NestJS NestJS is a progressive Node.js framework for building efficient, scalable, enterprise-grade server-side applications in TypeScript or Java… | 95 | 76465 | stable |
| typicode/json-server A Node.js CLI tool that turns a JSON file into a full fake REST API with CRUD endpoints, filtering, and pagination in seconds. It is widely… | 79 | 75690 | active |
| Strapi Strapi is the leading open-source headless CMS, written entirely in JavaScript/TypeScript, that lets developers design content models visua… | 95 | 73015 | stable |
| OpenBB-finance/OpenBB OpenBB's Open Data Platform (ODP) is an open-source Python toolset that integrates proprietary, licensed, and public financial data sources… | 91 | 72337 | active |
| nocodb/nocodb NocoDB is a free, self-hostable Airtable alternative that turns any Postgres, MySQL, or SQLite database into a smart spreadsheet with a ric… | 99 | 64749 | active |
| twentyhq/twenty Twenty is an open-source, self-hostable CRM platform positioned as an alternative to Salesforce, built with TypeScript, React, NestJS, and … | 94 | 55606 | active |
| Odoo Odoo is a suite of web-based open source business applications covering CRM, eCommerce, accounting, inventory, HR, manufacturing, and more.… | 77 | 53974 | stable |
| Mastodon Mastodon is a free, open-source, self-hosted social network server for microblogging built on the ActivityPub protocol, written in Ruby on … | 95 | 50254 | stable |
| CLIProxyAPI A Go-based proxy server that exposes OpenAI/Gemini/Claude/Codex-compatible API endpoints backed by CLI AI assistant accounts (Claude Code, … | 81 | 48891 | active |
| MHSanaei/3x-ui 3X-UI is an open-source web control panel for managing Xray-core proxy and VPN servers, supporting many protocols including VLESS, VMess, T… | 98 | 45386 | active |
| chatanywhere/GPT_API_free A hosted API forwarding/proxy service that provides free daily-quota access to GPT, DeepSeek, Claude, Gemini, and other major LLMs via a un… | 72 | 41190 | active |
| tRPC tRPC is a TypeScript library for building and consuming fully typesafe APIs without schemas or code generation, leveraging TypeScript type … | 95 | 40548 | stable |
| Kong/insomnia Insomnia is an open-source, cross-platform desktop API client for debugging, designing, testing, and mocking APIs across REST, GraphQL, Web… | 99 | 39954 | active |
| Medusa Medusa is an open-source (open-core) digital commerce platform with a built-in customization framework, offering modular commerce primitive… | 94 | 36020 | active |
| go-zero go-zero is a cloud-native Go web and RPC microservices framework with built-in engineering practices like circuit breaking, rate limiting, … | 98 | 33280 | stable |
| binarywang/WxJava WxJava is a comprehensive Java SDK for WeChat backend development, covering WeChat Pay, Mini Programs, Official Accounts, Open Platform, En… | 76 | 33051 | active |
| SGLang SGLang is a high-performance open-source serving framework for large language models and multimodal models, offering low-latency, high-thro… | 93 | 32504 | stable |
| Hasura GraphQL Engine Hasura GraphQL Engine is an open-source engine that auto-generates instant, realtime GraphQL APIs (and REST endpoints) over existing databa… | 98 | 32098 | active |
| lbjlaq/Antigravity-Manager Antigravity Tools is a desktop application built with Tauri v2, React, and Rust that manages multiple AI service accounts and provides one-… | 79 | 30738 | active |
| encode/django-rest-framework Django REST framework is a powerful and flexible toolkit for building Web APIs on top of Django. It provides serializers, class-based views… | 94 | 30144 | stable |
| python-telegram-bot/python-telegram-bot python-telegram-bot is a pure Python, asynchronous wrapper around the Telegram Bot API. It provides handlers, application builders, and uti… | 91 | 29434 | stable |
| Bagisto Bagisto is an open-source eCommerce platform built on Laravel (PHP) for B2C, B2B, multi-vendor marketplace, multi-tenant, and headless comm… | 99 | 27994 | active |
| PostgREST/postgrest PostgREST is a standalone web server that automatically exposes any existing PostgreSQL database as a fully RESTful HTTP API. Written in Ha… | 99 | 27629 | stable |
| PrefectHQ/fastmcp FastMCP is a Python framework for building Model Context Protocol (MCP) servers, clients, and interactive applications. It turns ordinary P… | 83 | 27399 | active |
| OpenAPI Generator OpenAPI Generator is a Java-based tool that generates API client libraries, server stubs, documentation, and configuration from OpenAPI 2.0… | 95 | 26685 | stable |
| OpenFaaS OpenFaaS is a serverless functions platform that lets developers deploy event-driven functions and microservices packaged as OCI/Docker con… | 76 | 26230 | stable |
| go-kratos/kratos Kratos is a lightweight Go framework for building cloud-native microservices, offering APIs for transport (HTTP/gRPC), middleware, registry… | 91 | 25892 | active |
| Zulip Zulip is an open-source team chat application with unique topic-based threading that combines the best of email and real-time chat. It incl… | 94 | 25774 | stable |
| Agent2Agent (A2A) Protocol Agent2Agent (A2A) is an open protocol, hosted under the Linux Foundation, that standardizes communication and interoperability between opaq… | 82 | 25503 | active |
| dubinc/dub Dub is an open-source link attribution platform combining branded short links, real-time conversion analytics, and affiliate/partner progra… | 77 | 24581 | active |
| krayin/laravel-crm Krayin CRM is a free and open-source customer relationship management application built on Laravel (PHP) and Vue.js, offering lead tracking… | 98 | 23724 | active |
| Saleor Saleor is an open-source, headless e-commerce platform exposing a GraphQL-only API for catalog, checkout, orders, payments, and promotions.… | 95 | 23266 | stable |
| Parse Server Parse Server is an open-source Backend-as-a-Service (BaaS) that runs on Node.js with the Express framework, providing REST and GraphQL APIs… | 95 | 21411 | active |
| netbox-community/netbox NetBox is an open-source web application that serves as the source of truth for network infrastructure, combining IP address management (IP… | 95 | 21394 | stable |
| cube-js/cube Cube Core is an open-source semantic layer that lets teams define metrics, dimensions, joins, and access rules in code, then serve them thr… | 95 | 20711 | active |
| tashfeenahmed/freellmapi FreeLLMAPI is an open-source, self-hosted LLM gateway that aggregates free tiers from 34 providers (600+ free model endpoints) behind a sin… | 81 | 20682 | active |
| jasontaylordev/CleanArchitecture A .NET solution template that scaffolds production-ready ASP.NET Core applications following Clean Architecture principles, with optional A… | 91 | 20491 | active |
| graphql/graphql-js GraphQL.js is the JavaScript/TypeScript reference implementation of the GraphQL query language for APIs. It provides tools for building Gra… | 96 | 20343 | stable |
| linlinjava/litemall litemall is an open-source small e-commerce mall system combining a Spring Boot backend, a Vue admin dashboard, a WeChat mini-program store… | 67 | 20337 | active |
| grpc-ecosystem/grpc-gateway A protoc plugin that reads protobuf service definitions with google.api.http annotations and generates a reverse-proxy server translating R… | 98 | 19991 | stable |
| Evil0ctal/Douyin_TikTok_Download_API A high-performance asynchronous Python service that scrapes and parses data from Douyin, TikTok, Kuaishou, and Bilibili, exposing a FastAPI… | 55 | 19679 | active |
| mountain-loop/yaak Yaak is an open-source, local-first desktop API client for sending HTTP, GraphQL, WebSocket, Server-Sent Events, and gRPC requests, built w… | 97 | 19120 | active |
| docusealco/docuseal DocuSeal is an open-source, self-hostable web application for creating, filling, and electronically signing PDF documents, positioned as a … | 91 | 18386 | active |
| ent/ent Ent is an entity framework (ORM) for Go that lets developers define database schemas as Go code and generates statically typed, explicit AP… | 79 | 17173 | stable |
| postalserver/postal Postal is a fully featured open-source mail delivery platform for sending and receiving email, a self-hosted alternative to Sendgrid/Mailgu… | 90 | 16769 | active |
| openimsdk/open-im-server OpenIM Server is an open-source instant messaging backend written in Go that powers in-app chat, group messaging, and voice/video calling. … | 87 | 16616 | stable |
| Rapptz/discord.py discord.py is a modern, async-ready Python library wrapping the Discord API, including a commands extension for building bots. It handles r… | 75 | 16155 | stable |
| amplication/amplication Amplication is an open-source platform that generates production-ready backend services (NestJS/Node.js, with .NET support) from data model… | 87 | 16014 | active |
| scalar/scalar Scalar is an open-source API platform centered on rendering beautiful interactive API references from OpenAPI/Swagger documents, with a bui… | 90 | 16000 | active |
| Quarkus Quarkus is a cloud-native Java framework optimized for containers and Kubernetes, offering fast startup, low memory footprint, and GraalVM … | 95 | 15848 | stable |
| Gotify Gotify is a self-hosted server for sending and receiving real-time messages over WebSocket, with a REST API for pushing messages and a slee… | 97 | 15801 | stable |
| spree/spree Spree Commerce is an open-source headless eCommerce platform written in Ruby, providing a complete REST API, TypeScript SDK, admin dashboar… | 98 | 15647 | stable |
| apitable/apitable APITable is an open-source, API-oriented low-code platform for building collaborative database-spreadsheet applications, positioned as an o… | 48 | 15575 | active |
| feathersjs/feathers Feathers is a full-stack framework for building web APIs and real-time applications in TypeScript or JavaScript. It provides a service-orie… | 98 | 15267 | stable |
| cachethq/cachet Cachet is an open-source, self-hosted status page system built on Laravel (PHP) for communicating downtime, incidents, and scheduled mainte… | 67 | 15231 | active |
| open-metadata/OpenMetadata OpenMetadata is an open-source metadata management platform that unifies data cataloging, lineage, data quality, governance, and business s… | 95 | 14986 | active |
| zitadel/zitadel ZITADEL is an open-source identity and access management (IAM) platform providing authentication and authorization out of the box, includin… | 95 | 14864 | active |
| Lemmy Lemmy is a self-hosted, federated link aggregator and discussion forum for the fediverse, similar to Reddit or Hacker News, built in Rust w… | 93 | 14566 | active |
| fish2018/pansou PanSou is a high-performance self-hosted API service for searching cloud drive (netdisk) resource links, aggregating results from Telegram … | 62 | 14365 | active |
| thanos-io/thanos Thanos is a set of composable components that turn existing Prometheus deployments into a highly available metrics system with unlimited lo… | 98 | 14188 | stable |
| apollographql/apollo-server Apollo Server is a spec-compliant, production-ready GraphQL server library for Node.js that supports schema-first development. It integrate… | 93 | 13947 | stable |
| ory/kratos Ory Kratos is a headless, API-first identity and user management server written in Go that centralizes login, registration, account recover… | 81 | 13849 | stable |
| Unleash/unleash Unleash is an open-source feature management platform for controlling feature flag rollouts across applications via a server and 25+ client… | 98 | 13761 | stable |
| Anarios/return-youtube-dislike Return YouTube Dislike is an open-source browser extension for Chrome and Firefox (plus a userscript) that restores the dislike count on Yo… | 92 | 13717 | active |
| rmyndharis/OpenWA OpenWA is a free, MIT-licensed, self-hosted WhatsApp API Gateway that wraps WhatsApp connections in a REST API with webhooks, a React dashb… | 78 | 13227 | active |
| mealie-recipes/mealie Mealie is a self-hosted recipe manager and meal planner with a FastAPI REST backend and a Vue frontend. It imports recipes from URLs via a … | 99 | 13079 | active |
| wallabag/wallabag wallabag is a self-hostable web application for saving web pages to read later, extracting article content while stripping ads and distract… | 78 | 12937 | stable |
| graphile/crystal Graphile's Crystal monorepo containing Grafast, a planning and execution engine for GraphQL.js, and PostGraphile, which auto-generates high… | 94 | 12929 | active |
| Automattic/wp-calypso Calypso is the JavaScript and REST API powered single-page web application that serves as the WordPress.com dashboard. It is built with Rea… | 67 | 12639 | active |
| PaperMC/Paper Paper is a high-performance Minecraft: Java Edition server based on Spigot that fixes gameplay and mechanics inconsistencies while greatly … | 77 | 12604 | active |
| bentoml/OpenLLM OpenLLM is a Python framework and CLI for self-hosting open-source large language models (Llama, DeepSeek, Qwen, Mistral, etc.) as OpenAI-c… | 76 | 12518 | active |
| seerr-team/seerr Seerr is a free, open-source web application for managing media requests and discovery, integrating with Jellyfin, Plex, and Emby media ser… | 98 | 12399 | active |
| lidge-jun/opencodex opencodex is a lightweight local proxy (installed via npm, running on a bundled Bun runtime) that translates OpenAI Codex's Responses API a… | 76 | 12224 | active |
| YOURLS YOURLS is a free, open-source PHP application for running your own URL shortener on your own server and domain. It provides an admin interf… | 86 | 12177 | stable |
| magento/magento2 Magento Open Source is a full-featured PHP-based eCommerce platform maintained by Adobe for building online stores. It provides catalog man… | 94 | 12169 | active |
| open-policy-agent/opa Open Policy Agent (OPA) is a general-purpose, open-source policy engine that unifies policy enforcement across the stack using a high-level… | 99 | 12164 | stable |
| linnovate/mean A fullstack JavaScript starter framework combining MongoDB, Express, Angular, and Node.js (the MEAN stack) for building scalable web applic… | 53 | 12054 | active |
| tadata-org/fastapi_mcp FastAPI-MCP is a Python library that automatically exposes FastAPI endpoints as Model Context Protocol (MCP) tools, preserving request/resp… | 45 | 11988 | active |
| newbee-mall newbee-mall is an open-source e-commerce system built with Spring Boot, offering a storefront (home page, product categories, search, cart,… | 54 | 11618 | active |
| NangoHQ/nango Nango is an open-source integration platform for building product integrations with 900+ pre-built API providers. It handles OAuth/API-key … | 94 | 11610 | active |
| quickwit-oss/quickwit Quickwit is an open-source, cloud-native search engine written in Rust and powered by Tantivy, designed to run sub-second search and analyt… | 94 | 11549 | active |
| simonw/datasette Datasette is an open-source tool for exploring and publishing data, turning SQLite databases into interactive websites with an accompanying… | 86 | 11412 | active |
| thedevs-network/kutt Kutt is a free, open-source, self-hostable URL shortener built with Node.js. It supports custom domains, link management, private click sta… | 96 | 11057 | active |
| BrasilAPI/BrasilAPI BrasilAPI is a free public REST API that centralizes Brazilian public data (CEP postal codes, and other government-adjacent data) behind mo… | 77 | 11055 | active |
| r-spacex/SpaceX-API An open-source REST API serving SpaceX launch, rocket, core, capsule, Starlink, launchpad, and landing pad data, hosted publicly at api.spa… | 10 | 10914 | active |
| unopim/unopim UnoPim is an open-source Product Information Management (PIM) and Digital Asset Management (DAM) platform built on Laravel, designed to cen… | 89 | 10862 | active |
| dotnet/eShop A reference .NET e-commerce web application from Microsoft demonstrating a services-based architecture using .NET Aspire. It serves as an e… | 62 | 10795 | active |
| 99designs/gqlgen gqlgen is a Go library for building GraphQL servers using a schema-first approach with code generation. It generates type-safe resolvers an… | 97 | 10753 | stable |
| StockSharp/StockSharp StockSharp (S#) is an open-source algorithmic and quantitative trading platform for .NET and Python, providing a trading API, 70+ broker/ex… | 67 | 10645 | active |
| distribution/distribution The CNCF Distribution project provides the open-source Registry, a stateless, scalable server-side application implementing the OCI Distrib… | 82 | 10583 | stable |
| corsairdev/corsair Corsair is an open-source TypeScript integration layer that lets applications and AI agents connect to 200+ third-party services (GitHub, S… | 59 | 10554 | active |
| Activiti/Activiti Activiti is a lightweight, open-source Business Process Management (BPM) platform whose core is a fast BPMN 2.0 process engine for Java. It… | 95 | 10541 | active |
| woocommerce/woocommerce WooCommerce is a free, open-source ecommerce platform built as a WordPress plugin, letting users turn any WordPress site into a fully custo… | 94 | 10476 | active |
| Anankke/SSPanel-UIM SSPanel UIM is a PHP-based multi-purpose proxy service management panel for running and administering proxy/VPN subscription services. It p… | 75 | 10414 | active |
| getlago/lago Lago is an open-source metering and usage-based billing platform that ingests usage events, manages subscriptions and pricing, and generate… | 95 | 10411 | active |
| NapNeko/NapCatQQ NapCatQQ is a modern bot protocol-side framework implemented on top of NTQQ, exposing a rich OneBot 11-compatible API for QQ messaging. It … | 87 | 10401 | active |
| rolling-scopes/rsschool-app RS School App is the web application powering the Rolling Scopes School education process, helping thousands of students train as front-end… | 76 | 10367 | active |
| electric-sql/electric Electric is a real-time read-path sync engine for Postgres that replicates data into clients via a low-level HTTP API with partial replicat… | 95 | 10339 | active |
| polarsource/polar Polar is an open-source billing and monetization platform that acts as merchant of record, offering usage-based billing, subscriptions, sea… | 97 | 10212 | active |
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