I can recall a few on the top of my head, but those are the exception rather than the norm: Blender & Mozilla, though that last one wasn't really a last act. I

I can recall a few on the top of my head, but those are the exception rather than the norm: Blender & Mozilla, though that last one wasn't really a last act. I think I saw a few others, but can't recall which ones, I'd be interested in such a list. Now, there are interesting communities that form around games, that tend to be a "dead product" after release, and for which there was a source dump (or not, actually): doom, openMW, openRA, etc.