There's a fair amount of info about it in this forum thread: http://www.nextcomputers.org/forums/viewtopic.php?t=2642&pos...
...and on this wiki (inc. screenshots):
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From the last page of this forum thread, it looks like the project is currently dead:
> i have stopped my work on Previous during the last month. It is unlikely that i will continue development in the future. I'm sorry for the bad news. I hope someone else will pick up the project and complete it. I'd be happy to assist with informations.
Source is here: http://sourceforge.net/p/previous/code/HEAD/tree/
Tried to build it on an ARM machine, but ran up against a few missing dependencies - trying to get those installed...