Yeah, that is PerfectRaid. From what I've found somewhere on the forums, it's being converted to ace2. Just need to be patient. =) I found that the Ace version still works good though~ You can still find it on some sites (i think it's also in the SVN).
Both versions are on WoWI. The most recent version is the Ace2 version, if you find the beta3 from April that is the Ace version. Both have pros and cons, you can try them both out and see which you like better.