.NET Reflector is a class browser and documentation viewer to easily view, navigate, search, decompile and analyze .NET assemblies in C# and IL.
Download | Presentation
.NET Resourcer is an editor for .resources and .resx files used with the .NET platform. Resourcer allows editing of strings and merging of resource files.
Download | GitHub
Writer is a simple editor for HTML files. Writer supports text layout and formatting, hyperlink editing and insertion of dates and pictures.