Facelets. Tomahawk work with facelets, just look at the tomahawk and facelets wiki pages
I switched to Faclets and it's great. I haven't used it with Tomahawk.
Right now the biggest problem I have with Facelets is dealing with older broken HTML. All your pages in Faclets have to be properly-formatted XHTML. This is good, but could be frustrating if you had a large body of HTML that needed to be made Facelets-able.