SymmetricDS - SymmetricDS is an asynchronous database replication software package that supports multiple subscribers and bi-directional synchronization.
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Kettle Pentaho - Pentaho Data Integration ( ETL ) a.k.a Kettle
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
CData Sync - Straightforward data synchronizing between on-premise and cloud data sources with a wide range of traditional and emerging databases.
Google Cloud Functions - A serverless platform for building event-based microservices.