pgHA: PostgreSQL Replication and High Availability (30-Jul-2013)

This proven solution leverages PostgreSQL's native streaming replication technology and pgBouncer. It efficiently supports multiple read-only slaves, seamless DDL replication, and various failover and/or disaster recovery modes of operation. All of this without any application level program changes!!  
Browse through our documentation or source code.   Our licensing is AGPL v3. The intent is that you are free to use and modify this code within your own organization. If you distribute this code (or derivatives) outside of your orgainzation, you must abide by the full terms of the license (including attribution).  
Binary distributions are available pre-integrated into the PostgresHA and BigSQL projects.  
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