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Coccinella is a free and open-source cross-platform communication tool with a built-in whiteboard for improved collaboration with other people.
TkCVS is a Tcl/Tk-based graphical interface to the CVS and Subversion configuration management systems. It will also help with RCS. The user interface is consistent across Unix/Linux, Windows, and MacOS X. TkDiff is included for browsing and merging your changes.