Subversion is an open source version control system. Founded in 2000 by CollabNet, Inc. Subversion universally recognized and adopted as an open-source, centralized version control system characterized by its reliability as a safe haven for valuable data. The simplicity of its model and usage and its ability to support the needs of a wide variety of users and projects, from individuals to large-scale enterprise operations. Git is an open source distributed version control system for effective, high-speed processing from very small to very large project version management. Darcs is a free, open source source code management system. Darcs is easy to learn and efficient to use because it asks you questions in response to simple commands, giving you choices in your work flow. You can choose to record one change in a file, while ignoring another. As you update from upstream, you can review each patch name, even the full "diff" for interesting patches. Bazaar is a d...