Are you interested in developing Open Source software for the desktop on Linux, Mac or Windows?  Do you want to get involved with creating applications for Linux and Windows embedded devices?  Trolltech releases software under the GPL and similar licenses for free software development, and the Qt/Qtopia ecosystem includes thousands of open source developers providing examples, forums, books and expertise to help you get started.
 

Our Dual Licensing Model

A key reason for Trolltech's success has been our dual licensing business model.  We release Qt and Qtopia under commercial licenses for commercial development and under the GPL and similar licenses for Open Source Software development.  After more than a decade of providing open source editions of our products, the ecosystem of Qt and Qtopia open source developers has grown to more than 200,000.

Where is Trolltech Software Used for Open Source Development?

Qt and Qtopia form the basis of thousands of open source projects, including KDE, Scribus, Licq, the Last.fm Player and the Qtopia Greenphone.

• KDE-Apps.org – listing thousands of Qt-based applications for the KDE desktop
  

• Qt-apps.org – browse hundreds of Qt-based open source projects
  
• Sourceforge – nearly one thousand active Qt projects

Get Connected with other Open Source Qt and Qtopia Developers

The community of open source Qt and Qtopia developers stretches around the world, with user groups, forums and community events taking place in many countries worldwide. 

• Browse community resources – find forums, tutorials and community projects
  
• QtCentre.org – one of the largest Qt forums
• Qtopia.net - community site for Qtopia open source embedded development
  

• Qt and Qtopia Open Source Edition Documentation
  
• Qt Tutorial – a step by step introduction to GUI programming with Qt
• Trolltech.com Developer Zone – FAQs, technical resources, in-depth notes and more
  
• Trolltech Labs – blogs, forums and open projects run by Trolltech developers
  
• Trolltech Mailing Lists - mailing lists on various topics related to Qt and Qtopia

Get Started Developing Open Source Software with Qt

The best way to get started is to download the GPL version of Qt or Qtopia.  Downloads are freely available on Trolltech.com, and from mirrors worldwide.  Follow the links below to download:

• Qt Open Source Downloads for C++ and Java Developers
  
• Qtopia Phone Edition Open Source Downloads

 
You must purchase a Qt Commercial License from Trolltech or from any of its authorized resellers before you start developing. The Commercial license does not allow the incorporation of code developed with the Open Source Edition of Qt into a proprietary product.  Learn more about Trolltech licensing terms at the Open Source Download FAQ.