A code analysis tool that checks for conformance to the .NET Framework Design Guidelines. FxCop inspects assemblies for more than 175 design defects. [Freeware] http://www.gotdotnet.com/team/fxcop/
A application/code generator for .NET developers. Generate web-based databound application - from simple online forms applications to a sophisticated CRM application. http://www.ironspeed.com
Merges the assemblies and XML documentation files produced by csc.exe and creates a compiled HTML Help file enabling browse own libraries just like the .NET Framework Class Library. [Open source, GPL] http://ndoc.sourceforge.net/
An object-to-relational mapping and code generation tool. Map relational tables to data objects, embed sophisticated SQL in them, and generate code for .NET (C# and VB.NET). http://www.alachisoft.com/
Unit-Testing add-in for Visual Studio .NET fully integrated with all major unit testing frameworks including NUnit, MbUnit, csUnit and Visual Studio Team System. http://www.testdriven.net
A framework, based on the JUnit family, for building application unit tests. It assists with test-driven design, a technique of Extreme Programming. By Philip Craig. http://nunit.sourceforge.net/