Q: The GUI does not seem to have a New entry in the File menu. How can I create a new project?
A: ktjview2 does not support this funktionality. It's mostly a project viewer. Use TaskJuggler if you want to create projects from the GUI.
Q: Why does taskjuggler use Qt when it's not an X11 application?
A: Qt is a very powerfull library that is much more than just a widget library. TaskJuggler uses Qt for all kinds of internal data types like lists and arrays. It also uses the Unicode functions, the SQL database interface and the XML support of Qt.