Database Labs offers Postgres as a service: focus on coding your app, not on becoming a database administrator. They take care of 24/7 monitoring and support, running continuous offsite backups, security patching and OS upgrades, so you can spend your time on your core business.
Memurai is a Redis 5 compatible cache and data store for Windows. Memurai runs natively on Windows and it's designed to provide the reliability and performance demanded by enterprise Windows environments. Memurai is an Enterprise solution design to solve the most challenging production workloads. They also provide a free version for developer and testing.
RethinkDB is the first open-source scalable database for the realtime web. It exposes an exciting new access model instead of polling for changes, the developer can tell the database to continuously push updated query results to applications in realtime. RethinkDB allows developers to build scalable realtime apps in a fraction of the time with fewer engineering resources.