» Bucardo: Postgres replication system - Asynchronous multi-master and master-slave replication system written in Perl [BSD license]..

» Command Prompt - Provides a supported, production quality PostgreSQL Replication. Also offers custom programming services, consulting and managed database hosting..

» DBBalancer - Load balancing multithreaded PostgreSQL connection pool that has a replication mode to keep load balanced backend servers in sync. Currently in Alpha..

» PgCluster - A multi master, synchronous replication system based on the PostgreSQL database server. Wiki, frequently asked questions, example setups and downloads..

» Rserv - Installation guide for triggers to provide Master/Slave replication..

» Slony-I Project - A master to multiple slaves replication system supporting cascading and failover [Berkely/BSD]..

» Usogres - Real time backup utility..