herbstluftwm

herbstluftwm is a manual tiling window manager for the X window system.

• the entire configuration happens at runtime via the tool herbstclient. So the configuration file is just a script which is run on startup. All configuration options, window rules, virtual desktops, keybindings, … can be updated live without the need to restart the window manager.
• every virtual desktop (called tag) consists of a tiling and a floating layer. Windows in the tiling layer fill up the screen space and the floating windows can be placed freely above them.
• both tiling and floating windows can be moved, resized, focused using the keyboard only.
• the tiling algorithm is based on splitting frames into subframes which can be split again or can be filled with windows.
• the screen space can be freely divided into "monitors" which may or may not match the actual (multi-)monitor hardware configuration. If you have a monitor with a large resolution just divide it into two or more virtual monitors such that you can view two virtual desktops at a time.
• all monitors share the same pool of tags. You can switch the contents of two monitors with a single keystroke.