Official Mono projects
The Boehm-Demers-Weiser conservative C/C++ Garbage Collector
Custom version of Boring SSL used by Mono
Class libraries from .NET Core
Fork of .NET Core Winforms for use in Wine Mono
Fork of .NET Core Winforms Data Visualization for use in Wine Mono
Fork of .NET Core WPF for use in Wine Mono
Accuracy-focused XNA4 reimplementation for open platforms
Giant stub of the Xbox Live features in XNA4
Mono open source ECMA CLI, C# and .NET implementation.
C-based implementation of the GDI+ API
Visual Basic Compiler and Runtime
Microsoft.VisualBasic.Compatibility replacement
Managed DirectX replacement
C# compiler and supporting class library binaries for bootstrapping Mono
A partial lightweight implementation of the NUnit test framework.
.NET Framework replacement for Wine
Test cases for Wine Mono that need Visual Studio to build.