Top API GitHub Repositories & Tools (2026)

Self-hosted SERP API for AI, SEO & automation. Browser-rendered Google, Bing, Yandex, Baidu, DuckDuckGo and Ecosia search with page extraction 🎉

Easily access public holidays for 200+ countries via .NET, REST API, Docker, or NuGet for online and offline use.

A Ruby gem for communicating with the Twilio API and generating TwiML

The OpenTelemetry C++ Client

Build all of your apps using what you already know and love ❤️

Improving GitHub's Forks list discoverability through automatic filtering. The project offers an online tool and a Chrome extension.

A .NET library for making bots using the Discord API.

Koillection is a self-hosted service allowing users to manage any kind of collections.

A package that lets you create TradingView screeners in Python

SGLang-Omni is a high-performance serving framework for audio models (TTS, ASR) and unified multimodal models.

Universal LLM API client — 163 providers, 14 native language bindings, powered by a Rust core

AI Inference Operator for Kubernetes. The easiest way to serve ML models in production. Supports VLMs, LLMs, embeddings, and speech-to-text.

Self-hosted geospatial data catalog with semantic search (pgvector), OGC/STAC APIs, and map builder. Built on FastAPI, PostGIS, React, and MapLibre.

Standalone CliProxyAPI usage tracker with SQLite persistence and built-in dashboard.

C#/.NET client library for the Binance.com cryptocurrency exchange REST and WebSocket APIs, supporting Spot and Futures trading and market data with strongly typed models.

Open-source, self-hosted enterprise & site search server built on OpenSearch. Crawls web / file / DB / cloud sources, 20+ languages, REST API, and AI/RAG & semantic search. Apache-2.0.

jevos is an open-source alternative to Jev for yes/no decisions that runs on your laptop.

An API to interact with the popular messaging app Discord

Stylish Graph APIs, built on JSON:API

A Laravel package which provides a list of the countries, states, cities, currencies, timezones, languages and IP Geolocation.