Not sure if you’ve seen this announcement, but Oracle have launched a free version of Oracle ADF, named ADF Essentials..
a version of Oracle ADF which can also run on other app
Servers and contains the full ADF Stack from ADF Faces , ADF Controller/Model and ADF Business Components.
See here for more information http://www.oracle.com/technetwork/developer-tools/adf/overview/adfessentials-1719844.html
also see an independent review at http://www.theregister.co.uk/2012/09/25/oracle_adf_essentials_launch/