Updated by FastRunner on Saturday, September 20th 2008.
PostgreSQL is a sophisticated Object-Relational DBMS, supporting almost all SQL constructs, including subselects, transactions, and user-defined types and functions. It is the most advanced open-source database available anywhere.
PostgreSQL has not has an 8K row limit in something like 5-8 years. It actually has built in row compression and spanning.
PostgreSQL
by Anonymous on Jan 19, 2001
Pretty good open source DB. It just needs to sort out it's 8KB row limit and provide referntial integrity support to get 5 stars. On the plus these things are already in the works.