Nerzhul 

(JetBrains repack to get single dll) Cecil is a library written by Jb Evain to generate and inspect programs and libraries in the ECMA CIL format. It has full support for generics, and support some debugging... More information

GPS Library for .Net. This is a fork of https://gpslibrary.codeplex.com with some of bugs fixed.

(JetBrains repack) NRefactory supports analysis of C# source code: it includes a parser, abstract syntax tree, type system, semantic analysis (resolver), code completion, and several refactorings.