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.
CVS nserver is the almost complete rewrite of network-related CVS code. It features improved security, support for virtual repositories with fully remote management of users, additional authentication methods such as PAM.
ACL (access control lists) and