X package:xmonad

The X monad, ReaderT and StateT transformers over IO encapsulating the window manager configuration and state, respectively. Dynamic components may be retrieved with get, static components with ask. With newtype deriving we get readers and state monads instantiated on XConf and XState automatically.

XConf, the (read-only) window manager configuration.

XState, the (mutable) window manager state.

A tiling window manager xmonad is a tiling window manager for X. Windows are arranged automatically to tile the screen without gaps or overlap, maximising screen use. All features of the window manager are accessible from the keyboard: a mouse is strictly optional. xmonad is written and extensible in Haskell. Custom layout algorithms, and other extensions, may be written by the user in config files. Layouts are applied dynamically, and different layouts may be used on each workspace. Xinerama is fully supported, allowing windows to be tiled on several screens.