Source Code Control System

- 1972 - closed source, free with Unix - Stored original version and sets of changes - Dominant till early 80's

Revision Control System

- 1982 - open source - Faster - stored latest version and sets of changes Only allowed for individual files till CVS

Concurrent Versions System

- 1986 - 1990 - open source - Multiple files, the entire project - Multi-user repositories

Apache Subversion

- 2000 - open source - Track text and images - Track file changes collectively

BitKeeper

- 2000 - Closed source, proprietary - Distributed version control - The "Community" version was free - Used for source code of the Linux kernel from 2002 to 2005 - Controversial to use proprietary SCM for an open-source project - 2005 "Community" was no longer free

Git

- April 2005 - Created by Linus Torvalds - Replacement for BitKeeper to manage Linux kernel source code - Open-source and free software - Better safeguards

Distributed Version Control

- Different users maintain their own repositories - No central repository - Changes are stored as change sets - Tracks changes not versions - Merge in change sets or apply patches - No need to communicate with a central server - Faster - No single point of failure - Encourages participation and forking projects - Submit changes for inclusion or rejection