Yiistrap is a popular twitter bootstrap extension for Yii Framework. Yii-Bootstrap was more or less a collection of widget which made it almost possible to extend. You can try it without any prior knowledge in Twitter Bootstrap itself.
Yiistrap provides helper methods for all Bootstrap components as well as widgets for the more complex components. You can also use the helpers to build your own widgets.
Yiistrap has its own extension library yiistrap-widgets, which already includes some useful widgets for Select2, DateTime Picker, Wysihtml5 and jQuery File Upload and many more.
Download : http://www.getyiistrap.com/
Github : https://github.com/Crisu83/yiistrap
License : Other License