RailsRumble Apps that Deserve to Be Startups 17 years ago
Our team made "Diversion" - http://diversion.r09.railsrumble.com/
We want to bring to normal human beings the cool things that Git and Github bring to developers! Instead of collaborating like you would on a wiki, you "divert" (fork) other people's work, so that both can keep working on their documents and grab each other changes.
You can see the history of everybody's documents, the past and the possible futures, who grabbed from whom, etc... And it works!