Qminder - Qminder works the way it sounds: It helps a company mind its queues.
Datahike - A durable datalog database adaptable for distribution.
Zenlist - Google ads for classifieds
Datomic - The fully transactional, cloud-ready, distributed database
FlexQ - Beyond a queue management system, Flexq is a unique solution that helps you reinvent the customer journey.
Matisse - Matisse is a post-relational SQL database.