Hacker News Reader

Re Hiphop I think HHVM + Hack (Facebook's internal "improved PHP") has superseded it but while HHVM is open sourced Hack isn't public.

Hack is just a piece of HHVM, it's open: http://hacklang.org/

Ah thanks, I didn't realize it was out. I read a separate article that said it hadn't been released yet -- it was probably outdated.