Barracuda, Bento, and Melati
by William Grosso
Related link: http://www.waferproject.org
One of the interesting references he gave was to the wafer project. Their goal, in their own words:
Wafer is a research project which compares the many open source web application frameworks which are available using a common example application. This research project is designed to compare the application frameworks on a level field by specifying an example application so that the application features become irrelevent and the merits of each framework becomes the focus.