The Revival engine WAS released for general use. However, asking for a whole engine is sort of frowned upon on the forums I come from, and probably here as well. Haven't lurked for long, you see =P
Anyways, yes it was released, and I used to have it. A computer crash, however, wiped out my hard-drive sadly, and I do not have it. Not that I would have given it after reading this topic through.