The CvsGui project is providing several high-end interface clients (WinCvs, MacCvs, gCvs) written in C++ using popular frameworks (MFC, PowerPlant, GTK+) with a scripting support via Python or TCL.
tclDBRCS is a database oriented revision control system which is fully database oriented and features full project/tag/branch support. It also supports optional encryption of file content. Can be used inside other applications as a package.
A personal document management system combining the features of backup, version control and document management tools.