C#

A C# port of shadowsocks

Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The most popular .NET UI client technology

FlatBuffers: Memory Efficient Serialization Library

.NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!

CodeHub is an iOS application written using Xamarin

Microsoft Cognitive Toolkit (CNTK), an open source deep-learning toolkit

Google's Material Design in XAML & WPF, for C# & VB.Net.

EF Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations.

Open-source web application framework for ASP.NET Core! Offers an opinionated architecture to build enterprise software solutions with best practices on top of the .NET. Provides the fundamental infrastructure, cross-cutting-concern implementations, startup templates, application modules, UI themes, tooling and documentation.

Generate and edit PDF documents in your .NET applications using the open-source QuestPDF library and its C# Fluent API. Build invoices, reports and data exports with ease.

Store securely encrypted backups in the cloud!

CoreCLR is the runtime for .NET Core. It includes the garbage collector, JIT compiler, primitive data types and low-level classes.

One framework for creating powerful cross-platform games.

C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.

Lean Algorithmic Trading Engine by QuantConnect (Python, C#)

ASP.NET Boilerplate - Web Application Framework

Powerful .NET library for benchmarking

Json.NET is a popular high-performance JSON framework for .NET

Chocolatey - the package manager for Windows

mal - Make a Lisp