MP-Suite is a client/server script that enables remote MySQL through an XML-RPC interface. This way, you can remotely access databases that are not remote-access enabled.
Porcupine is an open-source Python based web application server that provides front-end and back-end revolutionary technologies for building modern data-centric Web 2.0 applications.
The emerge toolkit is a state-preserved web development framework. Build your whole application in one easy place. Uses O/R Mapping on the back-end, and Comet-style sockets on the front. http://emergetk.com