Yes, I was waiting to see a Basecamp alternative written in PHP :D
Same here. Imagine the horror of the 2 top dudes at Basecamp.
Their customers don't give a shit about some open source alternative.
There's plenty of free Basecamp alternatives out there, but since they don't even come close to providing the same stability and polish none of them have a chance at unseating the original in the eyes of its core audience.