i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
WindowBlinds - WindowBlinds is a computer program that allows users to skin the Windows graphical user interface.
Xmonad - xmonad is a dynamically tiling X11 window manager that is written and configured in Haskell.
Cairo Shell - Cairo is a desktop environment for Windows.
awesome - A dynamic window manager for the X Window System developed in the C and Lua programming languages.
BB4Win - BB4Win (Blackbox for Windows) is an alternative shell for Microsoft Windows.