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Real time backup utility.
An asynchronous replica engine that provides some data ownership models and many conflict resolution algorithms. [open source, GNU License]
Provides a supported, production quality PostgreSQL Replication. Also offers custom programming services, consulting and managed database hosting.
Asynchronous multi-master and master-slave replication system written in Perl [BSD license].
A multi master, synchronous replication system based on the PostgreSQL database server. Wiki, frequently asked questions, example setups and downloads.
A master to multiple slaves replication system supporting cascading and failover [Berkely/BSD].