Top API GitHub Repositories & Tools (2026)

An open-source AI agent that brings the power of Gemini directly into your terminal.

Extremely fast, in memory, serialization, reflection, and RPC library for C++. JSON, BEVE, BSON, CBOR, CSV, JSONB, MessagePack, TOML, YAML, EETF

A Weather app for android with multiple sources 🌦🌞☔

Input OpenAPI. Output SDKs and Docs.

Enhanced ChatGPT Clone: Features Agents, MCP, Skills, DeepSeek, Anthropic, AWS, OpenAI, Responses API, Azure, Groq, o1, GPT-5, Mistral, OpenRouter, Vertex AI, Gemini, Artifacts, AI model switching, message search, Code Interpreter, langchain, DALL-E-3, OpenAPI Actions, Functions, Secure Multi-User Auth, Presets, open-source for self-hosting. Active

Claude Code Guide - Setup, Commands, workflows, agents, skills & tips-n-tricks from beginner to power user!

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

Cross-platform, customizable ML solutions for live and streaming media.

The Pokémon API

Send push notifications to your phone or desktop using PUT/POST

A mod to make and play Terraria mods. Supports Terraria 1.4 (and earlier) installations

Unrestricted Open-source alternative to AI video platforms — Free AI image & video generation studio with 600+ models (Flux, Midjourney, Kling, Sora, Veo). No content filters. Self-hosted, MIT licensed.

A powerful JavaScript library for interacting with the Discord API

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

The SDK to extract data and interact with any site on the web. Get started with Claude Code, Codex, Eve, Mastra, and more.

AI suite powered by state-of-the-art models and providing advanced AI/AGI functions. Includes AI personas, AGI functions, world-class Beam multi-model chats, text-to-image, voice, response streaming, code highlighting and execution, PDF import, presets for developers, much more. Deploy on-prem or in the cloud.

Morocco's 1,503 communes as open data: HCP codes, the 2024 and 2014 censuses, boundaries, an HTTP API and an MCP server.

LLM inference server with continuous batching & SSD caching for Apple Silicon — managed from the macOS menu bar

An opinionated GoLang framework for accelerated microservice development. Built in support for databases and observability.

gRPC to JSON proxy generator following the gRPC HTTP spec