Do you have something that does not fit Model View Controller pattern?
If you just mean a place for business logic, it is my understanding that business logic belongs to Actions in the default Seam file structure (I would call it Controllers to make it not sound more generic and not Actions as if it's struts but that's just a matter of preference).
My stateless and statefull EJB are in the sources folder "src/Action"
My entities beans in the "src/Model" folder
So, for my "Utils classes" like "Encrypt classes, ..." I think it is not a good idea to place it in the "src/action" ...
Yes, use a separate project ;-)
a new jar ?
why not? unless they are really tied to this specific project. Then you can always add another src dir.