Qt Extended (named Qtopia before September 30, 2008) is an application platform for embedded Linux-based mobile computing devices such as personal digital assistants, video projectors and mobile phones. It was developed by Qt Software, a subsidiary of Nokia.
Qt Extended features:
Qt Extended is dual licensed under the GNU General Public License (GPL) and proprietary licenses.
Devices and deployment 
As of 2006, Qtopia was running on several million devices, including 11 mobile phone models and 30 other handheld devices.
Models included the Sharp Corporation Zaurus line of Linux handhelds, the Sony mylo, the Archos Portable Media Assistant (PMA430) (a multimedia device), the Gamepark Holdings GP2X, Greenphone (an open phone initiative), Pocket PC, FIC Openmoko phones: Neo 1973 and FreeRunner. An unofficial hack allows its use on the Archos wifi series of portable media players (PMP) 604, 605, 705, and also on several Motorola phones such as E2, Z6 and A1200. The U980 of ZTE is the last phone running it.
Software development 
Native applications could be developed and compiled using C++. Managed applications could be developed in Java.
On March 3, 2009, Qt Software announced the discontinuation of Qt Extended as a standalone product, with some features integrated on the Qt Framework.
The Openmoko community has forked  the final stable release into Qt Extended Improved later renamed to QtMoko.
Other mobile operating systems 
External links