protosquared is a "data server prototype". It supports several data sources, such as XML and SQL databases and the communication protocol is highly configurable too.
Postgresql AutoDoc is a utility which will run through PostgreSQL system tables and returns HTML, DOT, and 2 styles of XML which describes the database.
Glom is a GUI that allows you to design MySQL table definitions and the relationships between them. It also allows you to edit and search the data in those tables.
Redfoot to framework do budowy rozproszonych aplikacji WWW z pomocą RDF i Pythona. Redfoot zawiera bazę danych RDF, parser RDF i serializer, API zapytań oraz język szablonów do budowy opartych o RDF serwisów WWW.