CodeDoc is a free, shared-source tool (subject to http://www.dwell.net/terms) from Dwell.Net that helps you generate a documentation set for your C# class libraries. CodeDoc converts XML comments into documentation topics, and lets you add "overview" topics. The output from CodeDoc is browser-based documentation browser with a table of contents and index. The documentation browser works either online (on a Web site) or offline (on a hard disk).
Documents ASP.NET source code (C# and VB)
Aids commenting of C/C++/IDL/ODL files
Get the comments from Excel files.
Replace comments in MS Excel.