Top FUN GitHub Repositories & Tools (2026)

A powerful little TUI framework 🏗

A utility-first CSS framework for rapid UI development.

Light, fluffy, and always free - Local Azure Emulator

Composio powers 1000+ toolkits, tool search, context management, authentication, and a sandboxed workbench to help you build AI agents that turn intent into action.

Collection of sample apps showcasing popular use cases using Cloud Functions for Firebase

A composable, cross-platform MVVM framework for .NET inspired by functional reactive programming. It moves mutable state out of the user interface, keeps each feature's logic in one readable place, and makes applications easier to test. Supports WPF, WinForms, WinUI, .NET MAUI, Avalonia, Uno Platform, Blazor and Android.

Accept Bitcoin payments. Free, open-source & self-hosted, Bitcoin payment processor.

Super-fast/easy runtime validators and serializers via transformation

jank is the native Clojure dialect with seamless C++ interop.

Cucumber for golang

Ultrafast serverless GPU inference, sandboxes, and background jobs

C++ Library for Audio Digital Signal Processing

Open-source TypeScript framework for building durable, resumable workflows. Supports Node.js and Bun.

Automated ACME SSL/TLS certificate management built around Azure Key Vault

CiviCRM (Core Application and Framework)

Ramda Adjunct is the most popular and most comprehensive set of functional utilities for use with Ramda, providing a variety of useful, well tested functions with excellent documentation.

A functional, Lisp-inspired language that compiles to PHP. Inspired by Clojure, Phel brings macros, persistent data structures, and expressive functional idioms to the PHP ecosystem.

Fastify 5 application boilerplate based on clean architecture, domain-driven design, CQRS, functional programming, vertical slice architecture for building production-grade applications 🚀

clad -- automatic differentiation for C/C++

The Open Source Test Automation Platform.