W24SevenOffice
WAngular (web framework)
WCitadel/UX
WDocument Update Markup Language
WDojo Toolkit
WEmber.js
WExt JS
WGollum browser
WIonic (mobile app framework)
WJsPHP
WJSON
WLively Kernel
WOpenLaszlo
WQooxdoo
WReact (web framework)
WSencha Touch
WWaveMaker
WYUI Library