Chords Master is one of the largest chord references available on and outside the App Store. Chords are auto-generated with notes and finger position indicators as you move along the fret on real guitar images with real guitar sounds.
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Here's a simple but effective chord library app for your iPhone, which is handy at rehearsal ... or even on stage when the brain fails. Not that I'd know anything about that...
Chords can be previewed with a swipe and there's a couple of sound choices for fun.
The description says Free, but there is a 99c unlock to get access to chords beyond Maj, Min, maj7, 7,6,aug, aug7 and maj7 . So you'd need to be in a jazz band to need it. I like Keynote Star stuff, so give this one a look-see!