Good news for all developers! QT will be available under the LGPL starting with version 4.5. The GNU Lesser General Public License (LGPL) is a free software license published by the Free Software Foundation. The LGPL places copyleft restrictions on the program itself but does not apply these restrictions to other software that merely links with the program. There are, however, certain other restrictions on this software. The LGPL is primarily used for software libraries, although it is also used by some stand-alone applications, most notably Mozilla and OpenOffice.org.
This option could increase Qt usage and adoption. You may see more cross platform commercial application on the Linux desktop. This is huge news for cross-platform developers.
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Qt is the standard framework for high performance, cross-platform application development. Trolltech ASA is licensing its Qt cross-platform development framework under the GNU General Public License version 3 (GPL v3), with immediate effect. GNU founder Richard Stallman said:
I am very pleased that Trolltech has decided to make Qt avaliable under GPL v3. This will allow parts of KDE to adopt GPL v3 too. Even better, Trolltech has made provisions for a smooth migration to future GPL versions if it approves of them.
Qt is already available under the GPL v2 and will continue to be so in addition to the GPL v3.
The GPL v3 license will make it easy and safe for free software developers to use Trolltech's Qt with the most recent license framework from the Free Software Foundation. Trolltech hopes that its move will inspire free software projects to use GPL v3 when programming with Qt.
Trolltech to adopt GPL 3 for Qt
KDE an easy-to-use desktop environment for UNIX / Linux. KDE 4 is the next major release and it is scheduled for release on December 2007. The new version claims t make KDE faster and more memory efficient by leveraging the greater speed and efficiency of Qt 4.x and increased efficiency in the KDE libraries themselves. There is a nice review published by Korneliusz Jarzebsk:
KDE 4 is coming. It’s starting to look and behave mature enough to use it on a normal desktop. This article is a little introduction to what you might be expecting from the brand new KDE due later this year. It’s been a whole month when I’ve investigated the new environment called KDE 4. Honestly I wanted to wait till “Beta 3″, which should have appeared on 5th October. But as you all can see it has never happened. On the IRC channel #kde4-devel I was informed that the “Beta 3″ should have been tagged yesterday but unfortunately it didn’t turn out to be true. Not waiting any longer I made my mind and I have updated the SVN and have run the cmake.
(KDE 4 Desktop)
=> KDE 4 Preview. Also don't forget to check KDE4 wikipedia page. It has more information and screen shots.