Open source. Open possibilities.

Refit is a type-safe REST client library for .NET that turns REST APIs into live interfaces, inspired by Square's Retrofit. It supports source generation, HttpClientFactory integration, and testing.

FlatRedBall is a cross-platform 2D game engine built with .NET and C#, featuring a dedicated editor to enhance developer productivity.

ET is a dual-end game development framework based on Unity3D client and C# server, supporting distributed architecture, Actor messaging, coroutines, hot updates, and AI-assisted development.

An open-source developer platform for building native cross-platform .NET applications for Web, Desktop, Mobile, and Embedded systems from a single C#/XAML codebase.

2024 Programming Challenges Roadmap: step-by-step exercises, solutions, videos, and rankings. Use any language and contribute your solutions.

MahApps.Metro is a UI toolkit for WPF that restyles standard controls with a modern Metro look, adds window chrome, theming, dialogs, and navigation controls without requiring control replacement.

ASP.NET SignalR is a library for .NET Framework developers that simplifies adding real-time web functionality, letting server-side code push content to connected clients instantly. It is now in maintenance mode, with only critical fixes.

KEFCore is an Entity Framework Core provider for Apache Kafka, enabling .NET applications to use Kafka topics as a distributed database. It offers full LINQ support and allows interaction with Kafka through standard EF Core models, abstracting away Kafka-specific client code.

Bogus is a simple, popular fake data generator for .NET (C#, F#, VB.NET). It generates realistic test data like names, addresses, and emails using fluent syntax or direct access. Supports numerous locales for internationalization.