1)   Code Historian 2.0
Code Historian performs file-differencing and code analysis, and assists with code reviews in SourceSafe, Perforce, or CVS. No server installation. Integrates with Visual Studio 6.0, .NET, and 2003. Also available in Explorer and on command-line.

 2)   Code Reviewer 1.2
Code Reviewer lets developers review each other's source code changes before they are checked into the version control system. Comment on specific lines of code. Any number of reviewers. All comments checked in when review is complete.