ZK 7 OUT NOW with more great themes & less code! A NEW theming experience with CSS 3, LESS & Bootstrap to achieve the best flexibility and simplicity to date!
Release note: http://www.zkoss.org/product/zk/releasenote/7.0.0
New features: http://books.zkoss.org/wiki/Small_Talks/2013/November/New_Features_of_ZK_7.0.0
Demo: http://www.zkoss.org/zkdemo/customize_theme