Pylons on Jython
Pending Improvements
Support more of the out of the box optional components, such as:
SQLAlchemy
Jinja2
Jinja2 may work on Jython now. Its tests need to be converted to nosetests so the test suite can run on Jython to ensure this
Genshi
Jim Baker and Ariane Paola have played around with Genshi on Jython. Its use of pyexpat is the biggest roadblock. Jython now includes a pyexpat, but it's not fully compatible with CPython's (and doesn't support all the features Genshi uses).
Turbogears 2
Ariane Paola made some progress porting TurboGears 2 components to Jython for Google's Summer of Code. Genshi and SQLAlchemy are the most important pieces that need porting
Older details: PylonsOnJythonOld