A powerful, cross platform, SQL database system
A Java SQL client for any JDBC compliant database
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Chess Database and PGN viewer
PHP database abstraction layer
An object relational-mapping (ORM) library for Java
Toolkit for working with and mapping geospatial data
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ITIL conform CMDB solution for documenting your entire IT landscape
Deductive Database with Datalog, SQL, RA, TRC, DRC