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.
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Pro File systems
Can also duplicate entire file systems.
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.