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it's an integration framework. they know that there are many frameworks, which creates an issue integrating them. i know i faced once an issue of an application written in struts, where we wanted new parts to be in wicket. from http://www.araneaframework.org/?pid=about:
Aranea integrates with the most prominent web frameworks, giving a way to assemble a collection of sub-applications developed using various web frameworks into a coherent whole.