API

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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 / public-apis

Star 364k

A collective list of free APIs

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

Updated May 20, 2025
Python

neovim

neovim / neovim

Sponsor

Star 92.4k

Vim-fork focused on extensibility and usability

c vim api lua neovim nvim text-editor

Updated Sep 1, 2025
Vim Script

fastapi

fastapi / fastapi

Star 89k

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 Sep 1, 2025
Python

hoppscotch

hoppscotch / hoppscotch

Sponsor

Star 73.8k

Open source API development ecosystem - https://hoppscotch.io (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 hacktoberfest

Updated Sep 1, 2025
TypeScript

strapi

strapi / strapi

Star 69.4k

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

nodejs javascript mysql api graphql cms koa typescript rest dashboard content-management customizable koa2 strapi cms-framework jamstack hacktoberfest content-management-system headless-cms no-code

Updated Sep 1, 2025
TypeScript

imgui

ocornut / imgui

Star 67.9k

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 Aug 28, 2025
C++

meilisearch

meilisearch / meilisearch

Star 53k

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 Sep 1, 2025
Rust

quivr

QuivrHQ / quivr

Star 38.4k

Opiniated RAG for integrating GenAI in your apps 🧠 Focus on your product rather than the RAG. Easy integration in existing products with customisation! Any LLM: GPT4, Groq, Llama. Any Vectorstore: PGVector, Faiss. Any Files. Anyway you want.

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

Updated Jul 9, 2025
Python

trpc / trpc

Sponsor

Star 38.4k

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

react api typescript nextjs next prisma

Updated Aug 31, 2025
TypeScript

ccxt

ccxt / ccxt

Star 37.9k

A JavaScript / TypeScript / Python / C# / PHP / Go cryptocurrency trading API with support for more than 100 bitcoin/altcoin exchanges

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

Updated Aug 30, 2025
Python

insomnia

Kong / insomnia

Star 37.1k

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 Sep 1, 2025
TypeScript

cli

httpie / cli

Star 36.5k

🥧 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

slatedocs / slate

Star 36.2k

Beautiful static documentation for your API

api static-site-generator api-documentation slate

Updated Jun 13, 2024
SCSS

mudler / LocalAI

Sponsor

Star 35k

🤖 The free, Open Source alternative to OpenAI, Claude and others. Self-hosted and local-first. Drop-in replacement for OpenAI, running on consumer-grade hardware. No GPU required. Runs gguf, transformers, diffusers and many more models architectures. Features: Generate Text, Audio, Video, Images, Voice Cloning, Distributed, P2P inference