PhoneGap is an open source implementation of open standards. That means developers and companies can use PhoneGap for mobile applications that are free, commercial, open source, or any combination of these.
Appcelerator is the first mobile platform to combine the flexibility of open source development technologies with the power of cloud services.
RhoMobile applications are OS-agnostic, able to support enterprise- and consumer-class operating systems including Windows® Embedded Handheld, Windows® CE, Windows® Phone 7, Apple® iOS, Android® and BlackBerry®. You have complete control over how applications behave on different devices. With RhoMobile Suite, you are finally free from OS design constraints, able to create business applications that are every bit as elegant looking and intuitive as their consumer counterparts.
CrossMobs is an SDK that lets you develop cross platform games using C++, Build in the cloud and deploy to iOS and Android. Simple and powerfull, it is easy and Free to get started.
A unified, HTML5-based user interface system for all popular mobile device platforms, built on the rock-solid jQuery and jQuery UI foundation. Its lightweight code is built with progressive enhancement, and has a flexible, easily themeable design.
Sencha Touch 2, a high-performance HTML5 mobile application framework, is the cornerstone of the Sencha HTML5 platform. Built for enabling world-class user experiences, Sencha Touch 2 is the only framework that enables developers to build fast and impressive apps that work on iOS, Android, BlackBerry, Kindle Fire, and more.