Are there any alternatives to The CMU Pronouncing Dictionary, commercial or open source?
I am searching for something similar, too. Next to it I found http://www.voxforge.org/home/downloads , any other source is highly appreciated.
I don't believe the answer is definitively "no," but I do know that CMU is the most popular pronouncing dictionary in my anecdotal experience. I believe it is open source so if it's missing something, perhaps you could find a way to add it (or request it be added).
Barring that, I would check with the folks at Language Log. They deal a lot with phonetics.
There is CELEX 2, available from the Linguistic Data Consortium, which contains phonology information and costs $300. The problem is that it's a little dated, and the English dictionary is BE, not AE.
You can use CALLHOME, too, but with $2250 it's more more expensive than CELEX.