Nah, most of the good (usable) utilities are actually on j2o. A couple are hosted elsewhere but you can find links on this forum or on other websites. There are indeed a couple of things which are kept private, but this is usually because they are unfinished and not really in an easily usable state.

As for "uberl33t undetectable hacks", there really isn't such a thing... anyone who knows what he's looking for can spot cheating by using spectator mode. This applies to pretty much any kind of hack, because cheating players behave differently from non-cheating players (main things to watch for: they react to information they shouldn't have, they can have more ammo than they should have, and they play at a level way higher than what you would expect).

I think the real problem with hacks is that they can disrupt public servers and the like: while you can usually deal with cheaters in a highly monitored, private server, it's not so easy to do that in a public game (or a private game with a full server, for that matter).