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
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Pros
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.
Cons
Con Installs triggers
SymmetricDS does install database triggers.
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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