Command Prompt - http://www.commandprompt.com/ Provides a supported, production quality PostgreSQL Replication. Also offers custom programming services, consulting and managed database hosting.
PostgresSQL Replicator - http://pgreplicator.sourceforge.net/ An asynchronous replica engine that provides some data ownership models and many conflict resolution algorithms. [open source, GNU License]
DBBalancer - http://sourceforge.net/projects/dbbalancer/ Load balancing multithreaded PostgreSQL connection pool that has a replication mode to keep load balanced backend servers in sync. Currently in Alpha.
Usogres - http://usogres.good-day.net/ Real time backup utility.
Rserv - http://techdocs.postgresql.org/installguides.php#rserv Installation guide for triggers to provide Master/Slave replication.
Slony-I Project - http://slony.info/ A master to multiple slaves replication system supporting cascading and failover [Berkely/BSD].
PgCluster - http://pgcluster.org/ A multi master, synchronous replication system based on the PostgreSQL database server. Wiki, frequently asked questions, example setups and downloads.
Bucardo: Postgres replication system - http://bucardo.org Asynchronous multi-master and master-slave replication system written in Perl [BSD license].
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