Datomic is described as 'database of flexible, time-based facts, supporting queries and joins, with elastic scalability, and ACID transactions' and is an app in the Development category. There are more than 25 alternatives to Datomic for a variety of platforms, including Linux, Windows, Mac, Online / Web-based and BSD. The best alternative is MongoDB, which is free. Other great apps like Datomic are Microsoft SQL Server (Freemium), Apache Cassandra (Free, Open Source), RethinkDB (Free, Open Source) and CockroachDB (Free).
SAP HANA is a completely re-imagined platform for real-time business. It transforms business by streamlining transactions, analytics, planning, predictive, sentiment data processing on a single in-memory database so business can operate in real-time.