SymmetricDS - SymmetricDS is an asynchronous database replication software package that supports multiple subscribers and bi-directional synchronization.

Supermetrics - Supermetrics condenses all the major vectors of data relevant to a user's marketing campaigns and helps them make sense of it all.

CData Sync - Straightforward data synchronizing between on-premise and cloud data sources with a wide range of traditional and emerging databases.

Airbyte - Replicate data in minutes with prebuilt & custom connectors

Apache Airflow - Airflow is a platform to programmaticaly author, schedule and monitor data pipelines.

Fivetran - Fivetran offers companies a data connector for extracting data from many different cloud and database sources.