... Motif and OpenLook (XView) are the two most popular wedget libraries for X Window. ... Most freely available toolkits and high-level libraries are of superior quality and easy-to-use. Search SAL: . X11 Libraries Toolkits ( Commercial, Shareware, GPL ) . ... GraphApp -- a toolkit for platform-independent GUI programming in C. GTK+ -- a fast and efficient GUI toolkit. ... VDK -- an easy to use C++ wrapper of Gtk+ GUI library for X. VDKBuilder -- a Rapid Application Development tool based on VDK. ...