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 * [Bedrock](http://bedrockdb.com/) - a simple, modular, networked and distributed transaction layer built atop SQLite.
 * [CitusDB](https://www.citusdata.com/) - scales out PostgreSQL through sharding and replication.
 * [Cockroach](https://github.com/cockroachdb/cockroach) - Scalable, Geo-Replicated, Transactional Datastore.
+* [Comdb2](https://github.com/bloomberg/comdb2) - a clustered RDBMS built on optimistic concurrency control techniques.
 * [Datomic](http://www.datomic.com/) - distributed database designed to enable scalable, flexible and intelligent applications.
 * [FoundationDB](https://foundationdb.com/) - distributed database, inspired by F1.
 * [Google F1](https://research.google.com/pubs/pub41344.html) - distributed SQL database built on Spanner.