InfoWorld: Linus Torvalds' BitKeeper Blunder May 2, 2005, 20 :30 UTC (8 Talkback[s]) (7579 reads) (Other stories by Neil McAllister)
"Open source developers, as you might expect, typically use free compilers, editors, and other tools to build their software. But three years ago Linux creator Linus Torvalds began using a proprietary, closed-source software version control system called BitKeeper to maintain the source code for the Linux kernel. It was a controversial decision, to be sure, and one that appears to have finally--and perhaps predictably--come back to bite him.
"Version-control systems facilitate collaborative software projects by maintaining a central repository of source code..."