Doulos is a set of tools for rapidly developing n-tier distributed applications, with a framework for writing business methods, a protocol for accessing those methods, and frameworks for creating web and native user interfaces that utilize the methods.
Note (March 22, 2004): Doulos was formally known as the "Doulos Web Application Framework", and was written for PHP. The vision for Doulos has since been enlarged to provide the tools for developing in an n-tier architecture, and the primary language has changed to Python. The old framework is no longer being maintained and development of the new toolkit has begun in CVS. More documentation to come.
Doulos is Open Source and is released under the GNU Public License (GPL) (See license here). It is housed on SourceForge, and is a project developed under the auspices of DiscipleMakers