秋梦无痕

from MSDN Magazine:

NUnit to write unit tests(By: James W. Newkirk, et al.)
NDoc to create code documentation
NAnt to build your solutions
CodeSmith to generate code(By: Eric J. Smith)
FxCop to police your code(By: Microsoft)
Snippet Compiler to compile small bits of code(By: Jeff Key)
Two different switcher tools, the ASP.NET Version Switcher(By: Denis Bauer) and the Visual Studio .NET Project Converter(By: Dacris Software)
Regulator to build regular expressions(By: Roy Osherove)
.NET Reflector to examine assemblies(By: Lutz Roeder)

工欲善其事，必先利其器。

You cannot expect to build a first-class application unless you use the best available tools.