- fastapi by fastapi, 105k stars. Python web framework for building APIs with type hints and OpenAPI docs
- gin by gin-gonic, 90k stars. Fast HTTP web framework for Go
- hoppscotch by hoppscotch, 81k stars. Open source API client for web, desktop and CLI, self-hostable
- strapi by strapi, 73k stars. Open-source headless CMS with a customizable admin panel and API
- nocodb by nocodb, 66k stars. Spreadsheet-style interface over databases with auto-generated APIs
- twenty by twentyhq, 61k stars. Open-source Salesforce alternative with AI features and a GraphQL API
- claude-cookbooks by anthropics, 55k stars. Notebooks with recipes for using Claude's API
- new-api by QuantumNous, 52k stars. Self-hosted LLM gateway with OpenAI and Claude compatible APIs and usage logs
- dayjs by iamkun, 49k stars. Small immutable date library with a Moment.js compatible API
- bruno by usebruno, 48k stars. Git-friendly desktop API client, a lightweight alternative to Postman
- mitmproxy by mitmproxy, 47k stars. Interactive intercepting proxy for inspecting and modifying TLS and HTTP traffic
- refine by refinedev, 36k stars. React framework for admin panels, dashboards and internal tools
- ntfy by binwiederhier, 36k stars. Send push notifications to phones and desktops with simple HTTP PUT or POST
- openai-python by openai, 32k stars. Official Python client library for calling the OpenAI API
- swagger-ui by swagger-api, 29k stars. HTML, JS and CSS assets that render interactive docs from OpenAPI specs
- react-admin by marmelab, 27k stars. React framework for admin apps on top of REST or GraphQL APIs, using Material UI
- openapi-generator by OpenAPITools, 27k stars. Generates API clients, server stubs and docs from an OpenAPI spec
- omlx by jundot, 24k stars. LLM inference server for Apple Silicon with batching, SSD cache and OpenAI API
- parse-server by parse-community, 21k stars. Open-source Node.js backend server with MongoDB or Postgres storage
- hey by rakyll, 21k stars. HTTP load generator that replaces ApacheBench
- apollo-client by apollographql, 20k stars. GraphQL client with caching and developer tools for JavaScript frameworks
- hurl by Orange-OpenSource, 19k stars. Runs and tests HTTP requests written in a plain text format
- iii by iii-hq, 19k stars. Runtime for composing and observing backend services in real time
- maxun by getmaxun, 18k stars. No-code tool that turns web pages into structured data feeds and APIs
- face-api.js by justadudewhohacks, 18k stars. Face detection and recognition in the browser and Node.js using TensorFlow.js
- apprise by caronc, 18k stars. Python library that sends notifications to many services through one API
- awesome-gpt-image-2-API-Prompts by Evolink-AI, 17k stars. Collection of prompts and API examples for GPT-Image-2
- OpenWA by rmyndharis, 17k stars. Self-hosted WhatsApp API gateway for sending and receiving messages
- scalar by scalar, 16k stars. Open-source API client and documentation tool built on OpenAPI specs
- Jackett by Jackett, 16k stars. Proxy server that exposes torrent and usenet trackers through one API
- supertest by forwardemail, 14k stars. Fluent HTTP assertion library for testing Node.js servers
- awesome-free-llm-apis by mnfst, 13k stars. List of LLM APIs with permanent free tiers
- quiche by cloudflare, 13k stars. Rust library implementing the QUIC transport protocol and HTTP/3
- OpenLLM by bentoml, 13k stars. Serve open-source LLMs like Llama and DeepSeek behind an OpenAI-compatible API
- check-if-email-exists by reacherhq, 10k stars. Checks whether an email address exists without sending mail, with an HTTP API
- nhost by nhost, 9.4k stars. Open-source backend with Postgres, GraphQL, auth and storage
- node-telegram-bot-api by yagop, 9.2k stars. Node.js client library for the Telegram Bot API
- R2R by SciPhi-AI, 8.1k stars. RAG API server with agentic retrieval, document ingestion and search
- treg by superdesigndev, 8.0k stars. Gateway and CLI for managing API keys and credentials used by agent tools
- no-as-a-service by hotheadhacker, 8.0k stars. API that returns random rejection excuses
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