Top API GitHub Repositories & Tools (2026)

Control how your documents get signed

A set of common utils for consuming Web APIs with Angular

Quick, painless, intuitive OCR platform written in Rust and TypeScript. Modern UI with modern API, with an emphasis on intuitive user experience.

The first open-source AI-driven tool for automatically generating system-level test cases (also known as fuzzing) for web/enterprise applications. Currently targeting whitebox and blackbox testing of Web APIs, like REST, GraphQL and RPC (e.g., gRPC and Thrift).

The Telegram bot framework that doesn't drive you nuts.

AI API gateway that ends manual channel switching with smart routing, auto failover, exponential cooldown, multi-URL scheduling, live request monitoring and soft-error detection.

A framework for building JSON:API compliant REST APIs using ASP.NET and Entity Framework Core.

Chapar is a simple and easy to use api testing tools aims to help developers to test their api endpoints. it support http and grpc protocols.

Pure Rust + CUDA LLM inference engine — no PyTorch, OpenAI-compatible, serves Qwen3 to Kimi-K2

First-class support for Consul Service Mesh on Kubernetes

😎 A list of awesome projects related to OpenAPI 3.0.x, curated by the community

Intuitive Data Workflows

Signatures for entire Python programs. Extract the structure, the frame, the skeleton of your project, to generate API documentation or find breaking changes in your API.

DevoxxGenie is an agentic plugin for IntelliJ IDEA that uses local LLM's (Ollama, LMStudio, GPT4All, Jan and Llama.cpp) and Cloud based LLMs to help review, test, explain your project code. Latest version now also supports Spec Driven Development with CLI Runners.

Laravel API for Ai Agents and humans.

Parallel Collectors is a toolkit easing parallel collection processing in Java using Stream API.

Backend.AI is a streamlined, container-based computing cluster platform that hosts popular computing/ML frameworks and diverse programming languages, with pluggable heterogeneous accelerator support including CUDA GPU, ROCm GPU, Gaudi NPU, Google TPU, GraphCore IPU and other NPUs.

The Janssen Project is a home for open source IAM components, featuring Auth Server (OAuth/OpenID), Agama low-code identity orchestration, and the Cedarling policy decision point. The "Janssen Server" distributions bundle IAM components under one control plane.

🔥 Next.js (React) headless eCommerce site with Typescript, WordPress (WooCommerce) backend and Algolia search

Feather is a modern Swift-based Content Management System.