I've been looking for a long a time for a good PM software that is standalone (personal use) or can be self-hosted (easy setup a must). Cloud hosting is a show-stopper when you're in a large company.
Did you realize that your demo page for Collabtive does not allow the user to choose their language? It appears to default to Chinese for the user interface.
Because lawyers, pointy hair bosses and so on. Someone simply makes a policy somewhere that all company data should reside on company machines, and no other companies' should share servers, server rooms or ops staff with ours. I'm not saying it makes any sense at all, but this actually happens.
http://collabtive.o-dyn.de/
Disclosure: I'm one of the lead devs.