Appcelerator Titanium Mobile is a multi-platform framework that can generate native applications for iOS, Android and Tizen (BlackBerry 10 in development). The tool has been developed by Appcelerator since 2009.
Titanium's JavaScript API allow native UI, multi-platform, application development: its SDK generates native code from the JavaScript code. Titanium enables access to all smartphone and tablet functionalities, and a multitude of extensions are also available (Twitter, PayPal, Barcode Scanner, TestFlight, etc.).
This product is available under the Apache License 2.0. Appcelerator offers a variety of support levels ranging from forums to 24x7.
Titanium currently supports iOS, Android and Tizen. BlackBerry 10 support is in development. Windows 8 will eventually be supported.