When BaseCamp first came out, I wondered when someone will make a BaseCamp clone. Well, it’s here. Check out the features in the screencast. It’s open sourced, and of alpha quality – but shows a lot of promise.
UPDATE: activeCollab has gone closed source, and is not free anymore in version 1.0. ProjectPier has taken up the 0.7 activeCollab codebase, and is free.