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.
ZCVSFolder is a Zope Product for performing version control on Zope objects. Its time of usefulness has probably come and gone (there are efforts to add versioning to the Zope core, as well as other products that support more platforms). However some fol
wxCvs is a cross-platform GUI frontend to the GNU Concurrent Versioning System (CVS). It is written in python and uses bindings to the wxWindows C++ cross-platform GUI toolkit (http://wxwindows.org). The python bindings to wxWindows is known as wxPyton