I was very excited about Datomic as well, but disappointed it wasn't Open Source.
I decided to fix that + build something that combines my favorite features from Postgres, Mongo, Neo4j, Couch/Pouch, Riak, Cassandra, Redis, Rethink, Firebase, and MySQL! Lol, it has only taken me 4 years and ~ still not v1.0 yet but the Internet Archive (Top 300 site in the world!) and others are running us in production. So give it a try - it is all MIT/Zlib/Apache2 licensed ( https://github.com/amark/gun ), no crippleware "opencore", and fast (20M ops/sec for cached data, which Datomic also does, but IDK their benchmarks off the top of my head).
I decided to fix that + build something that combines my favorite features from Postgres, Mongo, Neo4j, Couch/Pouch, Riak, Cassandra, Redis, Rethink, Firebase, and MySQL! Lol, it has only taken me 4 years and ~ still not v1.0 yet but the Internet Archive (Top 300 site in the world!) and others are running us in production. So give it a try - it is all MIT/Zlib/Apache2 licensed ( https://github.com/amark/gun ), no crippleware "opencore", and fast (20M ops/sec for cached data, which Datomic also does, but IDK their benchmarks off the top of my head).