[EDIT: Discontinued.]
Well, this looks like pretty much the veritably ultimate game engine selection resource — MobileGameEngines.com:

Lets you search for selected features easily, and each entry has basic descriptions, collects links to books on the framework, and allows comments. 57 engines listed for iOS at the moment, covering pretty near each and every game engine that we’ve ever mentioned in passing around here (only recent omission we noticed is that Blackberry framework ManiacDev found) and a great deal more besides!
h/t: @gaminghorror!
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