Openbox is a highly configurable, next generation window manager with extensive standards support.
Openbox is a free window manager for the X Window System, licensed under the GNU General Public License. Openbox was originally derived from Blackbox 0.65.0, but has been totally rewritten in the C programming language and since version 3.0 is not based upon any code from Blackbox.
Openbox is designed to be small, fast, and fully compliant with the Inter-Client Communication Conventions Manual (ICCCM) and Extended Window Manager Hints (EWMH). It supports many features such as menus by which the user can control applications or which display various dynamic information.
Openbox makes desktop environments better. By running Openbox inside the GNOME or K desktop environments, you can combine their ease and functionality with the power of Openbox. Your desktop becomes cleaner and faster, and is in your control, when you use Openbox.