Feb 072005
Qt from Trolltech had a dual-license since its beginning, but not for Windows. If you wanted to use Qt on Windows, you had to buy a commercial license, even if you were creating an open-source application. This has changed today, as you can read in this press-release.
Qt is a C++ application framework, and having that on Windows, Linux, HP-UX, AIX, Mac OS/X and some other operating systems means that you can write an application that compiles to NATIVE code without recoding. But the guys from Trolltech can convince you better than I can, so read more about Qt here.