Developer: PhoneGap Updated With Windows Phone 8 Support
Apache Cordova aka PhoneGap now includes full support for Windows Phone 8 application with new v2.3.0. Also the Internet Explorer 10 in WP8 is the engine behind the WebBrowser control in Cordova for WP8 which brings many enhancements.
Multiple screen sizes, Scalable Vector Graphics (SVG), ES5, gesture events, and more â€¦.aspx)
Find other open source frameworks supported in Windows Phone 8 here.