Bizgres

Bizgres is a comprehensive database platform for business intelligence built on top of PostgreSQL. It is ideal for entry-level and departmental workloads such as data marts and reporting applications in the 10-300 Gigabyte range. Greenplum, a commercial product which is built on top of Bizgres, has the ability to store and process terabytes of data using clusters of low-cost servers.

Homepage: http://www.bizgres.org