gitolite is an access control layer on top of git. It allows you to setup git hosting on a central server, and have multiple "virtual" users (i.e., not "Unix" users) access multiple git repositories, with fine grained access control (read control at the repo level granularity, write control at branch/tag/file/dir level). It has several other features, comprehensive documentation, does not require root permissions, and does not depend on anything except git, Perl 5.8 or later, and any POSIX shell.
Onzen is a graphical front end for the CVS, SVN, HG and Git revision control systems. It represents the files managed by the RCS in a tree view with detailed information and offers functions to update, commit, add, remove, rename, revert, diff, view files, and many more functions.
commit-patch allows the user to control exactly what gets committed to a version control system by letting the user supply a patch to be committed rather than using the files in the current working directory. This allows for more finely grained commits. It supports Darcs, Git, Mercurial, Bazaar, Subversion, and CVS.
The 64 Studio Platform Development Kit (PDK) is a version control system for GNU/Linux distributions, allowing the creation and management of many different projects, based on Debian and Ubuntu sources. PDK is written in Python, and the source code is well commented and contains documented examples.
File-Picker is a program to display and choose files from your Web site. It supports multiple languages. It uses AJAX to allow the user to interact with the server without reloading the page. You can pick several files at the same time. Its visual interface looks like a file explorer.
NbGit is a module for the NetBeans IDE that adds support for working with the Git version control system. It uses the JGit library created as part of EGit to interact with Git repositories. Because the module is pure Java code, it should work better across different platforms, modulo platform specific differences, such as file system behavior.
svngroup is a collection of tools designed to facilitate advanced access control lists for Subversion repositories. Unlike tools such as svnperms.py or authz, svngroup puts the manipulation of ACLs directly in the hands of group owners. Group owners are those individuals who have been granted "special" privileges in the repository and can make decisions regarding who can and can't submit to a particular location in the repository.