• bootstrap notes
• Foundation 5
• cascade framework
• Mochaui.com looks interesting (moved to github). https://github.com/mui/mochaui

ampleSDK (interesting approach) DojoToolkit and their nice set of widgets The always changing jQuery UI

• The radical Cappuccino - Objective-J based framework
• dhtmlx - good looking set of widgets
• sproutcore
• yui
• Semantic Ui comprehensive component framework
• UI Kit as used in get cockpit

• Foundation Abide validation framework

• Comparison of Responsive Frameworks