Tom's Virtual Tab Window Manager (tvtwm) is a superset of the X11R5 release of twm, initially written by Tom LaStrange. The major benefit of tvtwm over twm is the "Virtual Desktop". This allows you do define a substitute root window that is larger than your display area. This new virtual root window is the parent for all of your X clients. tvtwm provides a "Panner" which will let you see a scaled down representation of the whole virtual desktop. Using this panner and keys bound to functions added to tvtwm, you can move around this desktop while having your physical display showing only part of the whole desktop.
Multi-Cursor Window Manager creates a desktop environment that allows simultaneous input from multiple users. Users can work concurrently on different applications or desktop items. Each user gets a uniquely-colored cursor. It works by time-slicing the single system cursor. The state of each user's multi-cursor is maintained and restored just before an XEvent is sent to the system. Up to seven simultaneous users are supported.
wmmenu is a "dock application" for Windowmaker that provides a button bar to launch applications from. The bar opens automatically when the mouse enters the button. Multiple instances of the program can run at the same time; each one provides a menu that it reads from a separate file, so you can have as many different menus as you want.