PostgreSQL is a powerful, open source relational database system. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability, data integrity, and correctness. It runs on all major operating systems, including Linux, UNIX (AIX, BSD, HP-UX, SGI IRIX, OS X, Solaris, SunOS, Tru64), BeOS, and Windows. PostgreSQL Database server already embedded a useful GUI - PGadmin. If you want to import MS Access or other formats to PostgreSQL, you can install a Mac OS X GUI Navicat PostgreSQL ( http://pgsql.navicat.com ). PostgreSQL is an open-source descendant of this original Berkeley code. It supports a large part of the SQL:2003 standard and offers many modern features: complex queries foreign keys triggers views transactional integrity multiversion concurrency control Also, PostgreSQL can be extended by the user in many ways. Installation guideline for PostgreSQL OS X version.