The US PostgreSQL Association is a non profit public charity with the following purpose:
(a) Educate, promote and support the creation, development and use of the PostgreSQL Open Source Database software, a software system which is available to the general public without charge;
(b) Provide information and education regarding the use of PostgreSQL; and
(c) Organize, hold and conduct meetings, discussion, and forums on the contemporary issues concerning the use of PostgreSQL.
PostgreSQL.org is the home of the global PostgreSQL community. If you are looking for community support or software downloads you should visit the global site.