NEXT is a free, open source Java GWT HTML5 framework for building Native Looking web applications for smartphones and tablets. NEXT is provided under a Apache license and is available on GitHub for forking and contribution.
MVC based. Amazing looking UI catalog.
NEXT is Cross-Platform and runs on 6 different devices: iOS, Android, BlackBerry OS6+, webOS, Samsung bada and BlackBerry PlayBook.
It is completely based on web standards like HTML5 and CSS3.