DeforaOS Surfer is a portable Web browser, supporting tabbed browsing on a number of platforms, including embedded environments. It notably supports either XULRunner (Mozilla), WebKit, libGtkHtml, or its own lightweight implementation as the actual rendering engine to display pages.
Trek is both a Web browser and a new kind of social network. It allows its users to meet and interact by overlaying the Web with graphical avatars. Said avatars represent each user on a given page and can be moved freely about the content. Users can form parties or "browsing treks" and move about the Web in a group.