Top API GitHub Repositories & Tools (2026)

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.

Open Source standalone trashmail solution that ships its own mail server

Apache Log4net is a versatile, feature-rich, efficient logging API and backend for .NET

Batteries-included backend that works with any stack.

A Discord API wrapper for Python and asyncio built on good intentions.

Use Apache Causeway™ to rapidly develop domain-driven apps or modular monoliths in Java, on top of the Spring Boot platform. Write your business logic in entities, domain services or view models, and the framework dynamically generates a representation of that domain model as a webapp, GraphQL or RESTful API. For prototyping or production.

PnP PowerShell

Thelia is an open-source e-commerce CMS and framework built on Symfony 7 and API Platform.

Open-source construction ERP - BOQ, PDF/CAD/BIM takeoff, AI cost matching, 293 guided cases. 120,000+ priced positions, 45 languages, 192 modules. AGPL-3.0. pip install openconstructionerp

A Fork of Rikkahub with an overhauled UI and feature additions

A versatile Ruby web spidering library that can spider a site, multiple domains, certain links or infinitely. Spidr is designed to be fast and easy to use.

Simulate API failures, throttling, and chaos — all from your command line.

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).

A high-performance proxy rotation engine with automated IP management and real-time health monitoring

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