Conky is light-weight system monitor for X.
Pipe menus are generated at run time (on-the-fly) based on output of scripts. These are also called “dynamic menus,” and are often used to provide added functionality to Openbox or integration with other software on the system.
jgmenu is a stand-alone, simple and contemporary-looking menu application for Linux and BSD.
Tint2 is panel used in Mabox.