Datomic - The fully transactional, cloud-ready, distributed database
Datahike - A durable datalog database adaptable for distribution.
Valentina Server - Valentina Server is 3 in 1: Valentina DB Server / SQLite Server / Report Server
MarkLogic Server - MarkLogic Server is a multi-model database that has both NoSQL and trusted enterprise data management capabilities.
OrbitDB - OrbitDB is a serverless, distributed, peer-to-peer database.
PlanetScale - The last database you'll ever need. Go from idea to IPO.