Code Historian Description:

Code Historian performs file-differencing and code analysis, and assists with code reviews using information already present in your SourceSafe, Perforce, or CVS version control system. There is no server installation, and Code Historian works with any CVS or Perforce client software. These features are accessible through Visual Studio 6.0, Visual Studio .NET and 2003, the right-button menu in Explorer, or the command-line.