Reflector by Lutz Roeder - .NET Framework class browser to examine assemblies

TestDriven.NET - The perfect combination of Unit Testing with Visual Studio.NET

GhostDoc is a free add-in for Visual Studio that automatically generates XML documentation comments for C#.

SOAP UI is a tool for Web Service Testing tool to inspect, invoke the Web Services.

XML Notepad is an excellent editor for XML files.

Cropper is a screen capture utility to grab parts of your screen

Paint.NET is a free image and photo editing software for computers that run Windows.

TextPad is a powerful replacement for notepad, and some more extra stuff as well.

Word Web is a Powerful thesaurus and dictionary for Windows with word and anagram finder.

Winamp is a Media player allows to manage audio and video files.