Codestriker is a web application supporting online code reviewing, typically diffs generated by a Source Code Management system or plain unidiff patches. There are integration points with CVS, Subversion, Clearcase, Perforce and Visual SourceSafe.
Hayta-UML is a Web2.0 UML tool, that allows users to draw UML diagrams. A core design decision is to have a native version-control inside the application.