bryan over at Pipedot has released the source code for Pipecode, the software running pipedot.
Pipecode is written in PHP and the code is using the GPLv3.
I'm not a coder, but I read thru the wiki stuff, and appears to me the main advantage of Pipecode is that average folks can probably get it set up and running without going completely crazy. Whereas from all you've told us, getting slashcode properly functional required numerous arcane rites during specific phases of the moon; the usual black chicken tied to your monitor would not suffice, but its scalability seems hard to beat.
Both efforts are to be commended, and I'm glad to have both sites.