ClearCase is a comprehensive software configuration management system.
Ditz is a simple, light-weight distributed issue tracker designed to work with distributed version control systems like git, darcs, Mercurial, and Bazaar. It can also be used with centralized systems like SVN. Ditz features a simple, clean commandline interface, a robust plugin architecture which allows for adding commands and extending model fields and ditz output, a human-editable file format, and an active developer community.
etckeeper is a collection of tools to let /etc be stored in a git, mercurial, darcs, or bzr repository. It hooks into apt (and other package managers) to automatically commit changes made to /etc during package upgrades. It tracks file metadata that revison control systems do not normally support, but that is important for /etc, such as the permissions of /etc/shadow. It's quite modular and configurable, while also being simple to use if you understand the basics of working with revision control.
Gerrit, a Git-based system for managing code review, is helping to spread the popular distributed revision control system into Android-using companies, many of which have heavy quality assurance, management, and legal processes around software.
