Cosmos is an operating system "construction kit". Build your own OS using managed languages such as C#, VB.NET, and more!

This repository contains a suite of libraries that provide facilities commonly needed when creating production-ready applications.

TickerQ is a fast, reflection-free background task scheduler for .NET — built with source generators, EF Core integration, cron + time-based execution, and a real-time dashboard.

A lightweight NuGet and symbol server

An extensible framework to audit executing operations in .NET and .NET Core.

.NET Platform Architecture book (English, Chinese, Russian)

Headless CMS and Content Managment Hub

Infinitely Fast Deserializer for .NET, .NET Core and Unity.

A .NET library for reading and writing Microsoft Office binary and OOXML file formats.

Avalonia-based .NET Decompiler (port of ILSpy)

Template engine based on Microsoft's Razor parsing engine for .NET Core

A .NET GIS solution that is fast and reliable for the .NET platform.

High performance, low level networking APIs for building custom servers and clients.

A simple recipe for .NET Core microservices.

EF Core Second Level Cache Interceptor

A (not so) basic Minecraft Pocket Edition server written in C#

Minecraft server based on Orleans

Linq-like extension functions for Arrays, Span<T>, and List<T> that are faster and allocate less.

📊 A developer dashboard for Microsoft Orleans

The most popular and friendly mocking framework for .NET

Youtube Metadata Plugin for Jellyfin

A library which is able to decompile a delegate or a method body to its lambda representation

C# library to serialize LINQ expressions

Functional API for Microsoft Orleans http://orleanscontrib.github.io/Orleankka

Master Server framework for Unity

Jellyfin/Emby Metadata Provider

Unofficial .NET client for ClickHouse database

TinyOS in C#

SignalR backend based on Orleans.

.NET Spatial Reference and Projection Engine