NCover and NCoverViewer

NCover is a tool developed to instrument .NET code and gather code coverage data while your code executes. NCover is an open source initiative located on GotDotNet at:
http://www.gotdotnet.com/workspaces/workspace.aspx?id=3122ee1a-46e7-48a5-857e-aad6739ef6b9.
(http://www.ncover.org)

The NCoverViewer is a reporting plug-in for Visual Studio.Net which enables you to analyze the coverage of your code in an easy-to-use way.
http://www.gotdotnet.com/Workspaces/Workspace.aspx?id=03791d39-b33a-4021-81fb-db5b28cf984f