Jaspa
Spatial extension for relational database system. Follows OGC standars
Jaspa is a spatial extension for relational database systems, implements the OpenGIS Simple Features for SQL and partially the SQL/MM standard. Currently supports PostgreSQL and H2 as the RDBMS backends.
Jaspa brings around 200 spatial functions to relational database systems that support a full set of java store procedures. The first version of Jaspa was released in July 2010.
Jaspa has a similar functionality as PostGIS 1.5, supporting spatial operators and predicates, arrays...