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SymmetricDS

Java based open-source software supporting cross platform database replication between different databases.
Read article Keeping Databases in Sync “Open Source Style” using SymmetricDS.
And A Guide to Building an Active-Active PostgreSQL Cluster.

SpecsUpdate

PlatformsWindows, Linux, Mac, Android

Pros

Pro
Multi database

Support for Oracle, MySQL, MariaDB, PostgreSQL, MS SQL Server (including Azure), IBM DB2 (UDB, iSeries, and zSeries), H2, HSQLDB, Derby, Firebird, Interbase, Informix, Greenplum, SQLite, Sybase ASE, Sybase ASA (SQL Anywhere), Amazon Redshift, MongoDB, and VoltDB.

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Pro
File systems

Can also duplicate entire file systems.

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Pro
Runs on small systems

Can also run on Android phones.

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Cons

Con
Installs triggers

SymmetricDS does install database triggers.

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Con
Limited free version

The free version does not have a GUI and can only be used from the command line, see comparison.
There is an open source GUI dashboard available however: DRD Replicator.

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