Usogres - Real time backup utility.
DBBalancer - Load balancing multithreaded PostgreSQL connection pool that has a replication mode to keep load balanced backend servers in sync. Currently in Alpha.
Rserv - Installation guide for triggers to provide Master/Slave replication.
Command Prompt - Provides a supported, production quality PostgreSQL Replication. Also offers custom programming services, consulting and managed database hosting.
Slony-I Project - A master to multiple slaves replication system supporting cascading and failover [Berkely/BSD].
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