The Open Source version of PostgreSQL only includes the database management system and the associated programming interfaces. The Great Bridge and Red Hat versions of PostgreSQL each include a graphical installer and limited support for the installation.
If you want to use Great Bridge PostgreSQL, but feel that you will not need support, you can also download Great Bridge PostgreSQL from their website at http://www.greatbridge.com.
The main factor in deciding whether or not to use the Open Source version of PostgreSQL or one of the commercially available versions should be your business requirements. If you have a knowledgeable on-site technical support staff, the community version may do well for you. However, if you need installation, configuration, and management support, you may be better served by purchasing a commercial version of PostgreSQL.
If you prefer to do business with smaller consulting companies, we have compiled a modest list of professional companies providing support for PostgreSQL in the section called Commercial Support .