Darcs - Free, open source source code management system.
\"Distributed\r\n\r\nEvery user has access to the full command set, removing boundaries between server and client or committer and non-committers.\r\nInteractive\r\n\r\nDarcs 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.\r\nSmart\r\n\r\nOriginally developed by physicist David Roundy, darcs is based on a unique algebra of patches.\r\n\r\nThis smartness lets you respond to changing demands in ways that would otherwise not be possible. Learn more about spontaneous branches with darcs.\"