CurlyAnkles is a versatile library written in C on GNU/Linux, and has been written for GTK/GNOME. CurlyAnkles is an effort to marry docking widgets, customisable toolbars and menus with the ease-of-use of the GNOME desktop.
A dockable window framework for Fast Light Tool Kit (FLTK). FLTK Dock (pronounced "fulltick dock") provides advance, customizable toolbar and window with docking and floating functionalities for general desktop application.