SnapSource is a utility written in Perl to automatically and periodically take a snapshot (incremental backup) of your source code and display the modifications in a 2-column (original and modified) format similar to that of cervisia. Changes, additions, and deletions are displayed in different colors, customizable per user preference. It is not another CVS, and it is not a front-end to CVS, but it is supposed to be used in between CVS commits.
Xfiles is an interactive utility for comparing and merging one file tree with another over a network. It supports freeform work on several machines (no need to keep track of what files are changed on which machine). Xfiles can also be used as a cross-validating disk<->disk backup strategy.
ZFolder2Product takes the contents of a Zope folder and creates a custom Zope Product, which then re-creates the entire folder contents when installed. The advantage of using ZFolder2Product over a normal Zope exportation is that the folder contents are saved in external files usable within a version control system like CVS. After re-importing the files, you can edit them using the Zope Management Interface and export them back to the filesystem.
fs2svn takes a sequence of archive folders (snapshots or historical backups of a project) and makes a new Subversion repository, preserving their revision history. Each top-level folder creates one revision, which is backdated to its most recent file's modification date. Additions, changes, and deletions between one folder and the next are all recorded in the repository, and the efficient diff-based storage saves disk space over the original full or incremental backups.
sfre (system flight recorder editor) is a script that wraps a text editor or any arbitrary command and implements logging, file locking, and change tracking for the command executed. It is meant for helping system administrators manage a system in tandem without interfering with each other.