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An API can be thought of as an instruction manual for communication between multiple software apparatuses. For example, an API may be used for database communication between web applications. By extracting the implementation and relinquishing data into objects, an API simplifies programming.

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public-apis / public-apis

Star 498k

A collective list of free APIs

api lists open-source list development public resources dataset free software apis public-api public-apis

Updated Nov 11, 2026
Python

fastapi / fastapi

Star 105k

FastAPI framework, high performance, easy to learn, fast to code, ready for production

python api json framework web rest json-schema async swagger openapi python3 asyncio swagger-ui redoc openapi3 python-types uvicorn starlette pydantic fastapi

Updated Nov 11, 2026
Python

neovim / neovim

Sponsor

Star 104k

Vim-fork focused on extensibility and usability

c vim api lua neovim nvim text-editor

Updated Nov 12, 2026
Vim Script

hoppscotch / hoppscotch

Sponsor

Star 80.8k

Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia

testing api graphql http vuejs spa tools pwa rest vue rest-api websocket http-client api-client developer-tools api-rest testing-tools api-testing

Updated Nov 5, 2026
TypeScript

ocornut / imgui

Star 77.1k

Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies

api gamedev multi-platform gui library framework ui tools cplusplus native game-engine toolkit imgui immediate-gui game-development

Updated Nov 11, 2026
C++

typicode / json-server

Sponsor

Star 75.7k

Get a full fake REST API with zero coding in less than 30 seconds (seriously)

mock api json rest frontend test fake

Updated Mar 23, 2026
JavaScript

strapi / strapi

Star 73.5k

🚀 Strapi is the leading open-source headless CMS. It’s 100% JavaScript/TypeScript, fully customizable, and developer-first.

nodejs javascript mysql api graphql cms typescript rest dashboard content-management customizable strapi cms-framework jamstack hacktoberfest content-management-system headless-cms no-code posgresql

Updated Nov 12, 2026
TypeScript

meilisearch / meilisearch

Star 59.8k

A lightning-fast search engine API bringing AI-powered hybrid search to your sites and applications.

search api search-engine database ai fuzzy-search full-text-search vectors instantsearch semantic-search enterprise-search geosearch typo-tolerance site-search faceting search-as-you-type vector-search app-search vector-database hybrid-search

Updated Nov 12, 2026
Rust

mudler / LocalAI

Sponsor

Star 50.3k

LocalAI is the open-source AI engine. Run any model - LLMs, vision, voice, image, video - on any hardware. No GPU required.

api ai mcp decentralized text-generation distributed tts image-generation llama object-detection agents mamba libp2p audio-generation llm stable-diffusion musicgen rerank

Updated Nov 12, 2026
Go

chatanywhere / GPT_API_free

Star 45.9k

免费大模型API，支持免费调用GPT、DeepSeek等主流模型，免费额度10000点，每日刷新！另付费价格最低官方1-2折！

api gemini gpt grok claude chatgpt llm-agents deepseek

Updated Oct 30, 2026

ccxt / ccxt

Star 44.9k

A unified trading API with more than 100 crypto exchanges and prediction markets in JavaScript / TypeScript / Python / C# / PHP / Go / Java / Rust

api bot library crypto bitcoin trading ethereum cryptocurrency exchange market-data strategy btc cryptocurrencies trade eth arbitrage altcoin invest memecoin

Updated Nov 12, 2026
Python

trpc / trpc

Sponsor

Star 40.8k

🧙‍♀️ Move Fast and Break Nothing. End-to-end typesafe APIs made easy.

react api typescript nextjs next prisma

Updated Nov 11, 2026
TypeScript

Kong / insomnia

Star 40.1k

The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

api graphql curl rest-api websockets grpc http-client api-client electron-app api-design

Updated Nov 12, 2026
TypeScript

The-Vibe-Company / quivr

Star 39.6k

An open-source engine that turns continuous content streams into search and monitoring. Durable ingestion, hybrid search, alerts, and plugins for formats, models and business rules.

react javascript html api docker security privacy framework typescript database ai frontend vector chatbot postgresql openai rag groq llm chatgpt

Updated Nov 9, 2026
Go

httpie / cli

Star 38.7k

🥧 HTTPie CLI — modern, user-friendly command-line HTTP client for the API era. JSON support, colors, sessions, downloads, plugins & more.

python api debugging cli http client devops json development terminal web rest curl rest-api http-client api-client developer-tools usability api-testing httpie

Updated Dec 17, 2024
Python

directus / directus

Sponsor

Star 38.7k

The flexible backend for all your projects 🐰 Turn your DB into a headless CMS, admin panels, or apps with a custom UI, instant APIs, auth & more.

javascript mysql api graphql cms app node typescript sql database vue sqlite postgresql mariadb data-visualization mssql directus composable headless-cms no-code

Updated Nov 12, 2026
TypeScript

songquanpeng / one-api

Star 37.4k

LLM API 管理 & 分发系统，支持 OpenAI、Azure、Anthropic Claude、Google Gemini、DeepSeek、字节豆包、ChatGLM、文心一言、讯飞星火、通义千问、360 智脑、腾讯混元等主流模型，统一 API 适配，可用于 key 管理与二次分发。单可执行文件，提供 Docker 镜像，一键部署，开箱即用。LLM API management & key redistribution system, unifying multiple providers under a single API. Single binary, Docker-ready, with an English UI.