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Speaking of Datomic, are there any alternatives that are completely free?

Datomic has two free editions - Datomic Free and Datomic Pro Starter. http://www.datomic.com/pricing.html

I know about those, but the key word in my post was completely.

In what way are the free editions not free enough for you? (serious question, not trolling)

I'm guessing he means the GPL sense of free as in freedom, not free as in beer?