CVSsuck is a mirroring tool for CVS repositories. Unlike other tools such as CVSup or rsync, it uses cvs command to access the repository. So, it works well with remote repositories without a special server or shell account. However it is inefficient and not perfcect because CVS client/server protocol is not designed for mirroring. If a server provides special way to grab a repository, you shouldn't use CVSsuck.
An experimental tool to minimize connections to a CVS server especially designed to use with CVSsuck