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I wonder when we are going to see an open source implementation of Datomic's main ideas in the database space.

There looks to be a dormant attempt at the alpha stage here: https://github.com/runexec/PossibleDB

for bonus points, it uses rethink as the backing store

DataScript already can run on JVM natively. Only thing missing is durable storages (it’s inmemory only now, same as JS version)