Fltk works fine as a shared library, though, and has started being included on Linux distrubutions. Harmony JX JX is a full-featured application framework and widget library for use with the X Window System. It is built directly on top of Xlib and has been carefully optimized for performance. LessTif Lesstif is a re-implementation of the Motif widget set for X11. Lesstif is not yet complete, but work is progressing quickly.
Many applications compile out of the box with lesstif.
Lesstif aims to be binary compatible with Motif, so that simply by changing libraries a program dynamically linked with Motif should work with lesstif. Qt is a toolkit for software developers. It has everything you need to create professional GUI applications. And you can create them quickly. Qt is a multi-platform toolkit.