Maltese, planche, inverted cross (if you buckle it tight enough it won't), victorian (lol).
Mostly the stuff you can do is the variations on moves. For example, azarian (inverted hang backwards roll straight body to cross) or things like cross push with straight body to maltese. Inverted cross to maltese and back.. stuff like that. Basically if you have a group of guys working on strength have one guy make up a series of a couple moves in a row and then have everyone practice it.. and then alternate taking turns.
f the moves get too easy (generally happens with a pulley assist as opposed to weight assist), you can add a weight belt if you really need to or take strength moves to assist without the pulleys.