WHO OWNS QT?

Answer 1

If you mean Qt the framework, then Nokia owns it, and has ever since they bought out TrollTech a few years ago, however, it is also licensed under both the GPL and the LGPL, making it free/open source software, meaning you can freely modify it and redistribute it so long as you follow the terms of those licenses.

Nokia also offers Qt under a proprietary corporate license. But as far as I can tell there's no actual practical differences between the open source Qt and the proprietary Qt, except that the proprietary Qt is offered to companies whose Pointy Haired Bosses in charge of programmers are unreasonably squeamish about FOSS licenses.

If you mean QT as short for QuickTime, then Apple owns it, and its nothing like Qt the framework. QuickTime is an older multimedia library in use by Apple that's been superseded by other libraries in OS X.