... I send out a list of most interesting libraries and apps in the "C#" section to about 1100 subscribers.
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Source code for 'Illustrated C# 7' by Daniel Solis and Cal Schrotenboer
Source code for the CodeContracts tools for .NET
Analyzes C# source code to enforce a set of style and consistency rules.
Source Code for 'Design Patterns in C#' by Vaskaran Sarcar
Source code for 'C# 6.0 and the .NET 4.6 Framework' by Andrew Troelsen and Philip Japikse
Source code for 'Pro C# 7' by Andrew Troelsen and Philip Japikse
Some source codes from my procedural 3D world generator project for Unity.
Source browser website generator that powers http://referencesource.microsoft.com and http://source.roslyn.io
Source from the Microsoft .NET Reference Source that represent a subset of the .NET Framework