API Server GitHub Repositories (2026) · Open Source Tools

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

⚡ Pure-Rust WebGPU inference engine — OpenAI-API compatible, GGUF native, runs on any GPU. No Python. No llama.cpp. Single binary.

ClamAV REST API. Scan files using simple POST request.

Open-source Back-end, self-hostable & ready to use - Real-time, storage, advanced search - Web, Apps, Mobile, IoT -

Easy to use C++17 HTTP Server with no compromise on performances. https://matt-42.github.io/lithium

ESB, SOA, REST, APIs and Cloud Integrations in Python

Multitenant backend server for building web and mobile apps rapidly. The backend for busy developers. (self-hosted or hosted)

A crawler and API server for Liquor Control Board of Ontario retail data

📡 Cloudflare worker powering cdnjs.com + api.cdnjs.com - The #1 free and open source CDN built to make life easier for developers.

openapi_first is a Ruby gem for request / response validation and contract-testing against an OpenAPI API description. It makes APIFirst easy and reliable.