JWM (Joe's Window Manager) is a Window Manager for X11 using at minimum Xlib.
This is the first WM I successfully compiled and installed on my Ubuntu x64 VM.
great choice for virtual machines that need an X enviroment ( oracle configuration, for instance ), but have to be kept minimal on size and or resources. I've replaced twm with this on all my VM's.
This is the best light weight vm that works perfectly mostly when you want to run games in 3D (or any other games) that conflict with Unity/Compiz from Ubuntu. And is extensively configurable. You open a new X session at :1 and run JWM there, and everything runs easy and stable after that :), thx!