What are cross-platform free/Open source Framework to create Touch based web apps/site using HTML/CSS/JS available?

What are cross-platform and cross browser and license free/Open source framework to create Touch/Multitouch based Web apps/site using HTML/CSS/JS, for mobile devices, specially for latest versions of Android, Blackberry, Windows 7, iphone and ipad available? For desktop websites I'm a jQuery lover.

I know Sencha but it's not free I think.

I know jQtouch but it's only for iPhone and I also know jquery mobile but I'm not cofirm, is it as powerful as Sencha? It's not necessarily for me to go with jquery mobile, if there are another better framework available than this

I want to make compatible with Android, Blackberry, Windows 7 also. not only for iphone and ipad.

Jquery lover? Use Jquery Mobile http://jquerymobile.com/

http://jqtouch.com/ and http://jquerymobile.com/ are the ones that spring to mind.

Over a million mobile developers use Sencha. It leverages HTML5 and CSS3 and allows you to build amazing mobile applications without worrying a bunch of things you would otherwise do. It has layouts and a pile of widgets. The productivity is pretty high.

Update: Sencha is dual-licensed meaning that if you develop commercial software, you need to pay their fee. If you develop an open source application, Sencha is completely free!

See their licensing: http://www.sencha.com/products/touch/license.php