Portable.NET is a free implementation of .NET; it is a complete suite of compilers, libraries and tools for running and developing .NET applications.
Download it from here: http://getdotgnu.com/downloads
Some cool snapshots:
Windows XP theme
MDI Text Editor
Hammad Rajjoub.
UG Leader and Member Speakers Bureau,
Ineta Pakistan.
http://dotnetwizards.blogspot.com