PostgresSQL Replicator - An asynchronous replica engine that provides some data ownership models and many conflict resolution algorithms. [open source, GNU 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]..