CVS

The Concurrent Versions System (CVS), also known as the Concurrent Versioning System, is a free software client-server revision control system in the field of software development. A version control system keeps track of all work and all changes in a set of files, and allows several developers (potentially widely separated in space and time) to collaborate. Dick Grune developed CVS as a series of shell scripts in July 1986.
In addition to commercial software developers, CVS became popular with the open source software world and was released under the GNU General Public License. While there was regular development to add features and fix bugs in the past, including regular builds and test results, there have been no new releases since 2008.