Wobbles is a free-ware vibrato plugin for Mac OSX 10.4 and higher. The effect features adjustable shape, depth and speed.
Chorus and phaser type effects can also be achieved by using the dry/wet knob. It has not been widely tested, so please let me know if you have problems! If there is interest in this plugin then I might update it with a couple more features (tempo syncing, custom LFO shapes).