Either for the purpose of porting GUI code or the creation of hybrid applications that included e.g. a Qt GUI with a Tcl-based interactive console.
Our main product Squish GUI Tester supported testing of such hybrid applications as well.
After having reached a feature-complete state and years of low-maintenance mode we have decided to release the product into the public domain for free. We are happy to provide a source code package for download. Just contact us via email@example.com. The latest version included support for Qt versions up to 4.x.