gadfly.sourceforge.net/ — Gadfly is a simple relational database system implemented in Python based on the SQL Structured Query Language.
General information about copyrights (2005)
Generalization of Deferred Execution in Python
GNU General Public License
GNU-Enterprise ↑www.gnuenterprise.org — A promising project. Similar goals as Lino.
Also written in Python.
GNUe works with an XML database schema.
I prefer to write a database schema in Python.