2. DapperDapper - a simple object mapper for .Net
4. DnscontrolSynchronize your DNS to multiple providers from a simple DSL
5. MarkdownsharpOpen source C# implementation of Markdown processor, used by Stack Overflow.
6. HttpunithttpUnit tests compliance of web and net servers with desired output.
7. Stackexchange.precompilationRoslyn based csc.exe and aspnet_compiler.exe replacement with metaprogramming hooks for ASP.NET MVC projects from the pre-DNX era
10. NetgainA high performance websocket server library powering Stack Overflow.
11. BlackboxSafely store secrets in Git/Mercurial/Subversion
13. PagedownThe Markdown editor and converter used on Stack Overflow and the other Stack Exchange sites
19. stackeggThe core game logic of Stack Overflow's April 1st 2015 game, StackEgg.