I'm doing a project with 2 other guys. We are each on a different continent so i need a web based tool where we can collaborate, share files, store information etc. I've looked all over the internet but nothing seems to fit my needs. I want to host it on my own server. And because i don't have any money it needs to be open source too... I tried stuff like redmine, project pier but i need something more like google docs on my own server. Management functions like tasks, time-management etc. are good, but for now we are doing mostly research and planning so the focus lies on collaboration.