I don't know any JSF library fully supporting a JSF implementation for the portlet environment so far.
We started to list components here:
Input from users is very appreciated :) Feel free to add components from any library that you tested.
At the moment I'm doing a research on possible development technologies for a portlet enabled application. Since it is my first time I'm doing this kind of development and I'm comming from the servlet world I have quit good experiences with jsf frameworks. Do you have any suggestions for similar apporches (Best practice) for the creation of the forms?
You can still use JSF, with standard components, your own custom components, and from a list of components that work in a portlet environment.