Sensible database change management

Bucardo multimaster and master/slave Postgres replication

Nagios check_postgres plugin for checking status of PostgreSQL databases

Query Performance Monitoring Tool for PostgreSQL

Migration tool to convert a Microsoft SQL Server Database into a PostgreSQL database, as automatically as possible

PostgreSQL Automatic Failover: High-Availibility for Postgres, based on Pacemaker and Corosync.

PostgreSQL System Impact reporting tool

PostgreSQL database-cluster manager — You might be interested in https://github.com/petere/homebrew-postgresql as well.