Comparison of version-control software

Columns: Software | History | Notable users
GNU arch | Started by Tom Lord in 2001 , it later became part of the GNU project . Lord resigned as maintainer in August 2005 | available for GNU Savannah and Gna.org projects | IC Manage | Developed by IC Manage , Inc which was founded in 2003 by Shiv Sikand and Dean Drako | many organizations worldwide | PTC Integrity | Originally developed by MKS Software . Purchased by PTC in May 2011 | Many global engineering and IT organizations | Mercurial | Started April 6 , 2005 by Matt Mackall , following the BitKeeper controversy . First released on April 19 , 2005 | Python , Mozilla , OpenJDK , NetBeans , Xine , Xen , OpenSolaris , wmii , MoinMoin , Linux-HA , Pidgin , Gajim , Nginx , PyPy , SDL , Facebook , Google ( as a UI on top of Piper ) | Monotone | First released in April 2003 | CTWM , I2P , Botan | Perforce Helix Core | Developed by Perforce Software , Inc which was founded in 1995 by Christopher Seiwald | FreeBSD , Scania AB

Example questions:
Who bought-out the software company who 's version management software was used by Lockheed Martin and Verizon Wireless ? | What hash technology does the software first released in April 2003 use ? | Where is the company who 's software the Linux Kernel used from 2002 to 2005 based ? | What was the buyout price for the company responsible for ClearCase ? | Who currently maintains the software version control technology originally developed by Linus Torvalds ?

Answers:
Micro Focus | SHA-1 | Los Gatos , California | US $ 476 million | Junio Hamano