Opensource BaseCamp alternative

activeCollab an open-source project management and collaboration tool (alpha) aimed fairly squarely at Web 2.0 / Ruby on Rails poster-child 37signals's Basecamp except you download and install this on Apache (it's PHP+MySQL). Interesting. Base Camp's sweet spot seemed (at least to me) to be loosely formed projects teams. We trialled it with teams consisting of our professional services field staff, system integrators and engineers from customer sites. These teams generally don't live long enough to establish lots of procedures, so something like Basecamp, provides them with this basis and more importantly provides us with visibility into and accountability of the various activities of team members.

But it isn't that cheap and we don't need a hell of a lot of functions from it. So does BaseCamp have a future or is something like activeCollab going to be the next Drupal for the informal project management space. Or put another way, since many of the customers of BaseCamp are ably capable of installing a PHP/MySQL application, would have a corporate knee-jerk reaction to in-house all sensitive data, what should be the price point of BaseCamp?