This site is no longer maintained, you see a static version as of March 18, 2018. I expect links to break.
For comments and corrections, or to propose something to be included in the list, please send a mail. I do not take any guarantee about the quality of software referenced here. Use at your own risk. I want to say thank you to all those people that pointed me to new systems to include here. It is amazing that not only the authors themselves help to keep this list as complete as possible, but also people that come across something interesting.
Robert Tolksdorf, is-research.