Bluetile is a tiling window manager designed to integrate with the GNOME desktop environment. It provides both a traditional, stacking layout mode as well as tiling layouts where windows are arranged to use the entire screen without overlapping. Bluetile tries to make the tiling paradigm easily accessible to users coming from traditional window managers by drawing on known conventions and providing both mouse and keyboard access for all features.
Orion is a window manager for the X11 windowing system. It is written in Scheme and accesses Xlib via the scx library for scsh. It is in fact a family of window managers that can be nested. This enables great flexibility and efficient handling of X11 applications. It currently comes with four child window managers: a conventional moving window manager, a window manager for stacking windows in a frame, a window manager for splitting windows horizontally, and vertically and a work space manager. It also supports saving the window manager layout and programmatic configuration.
i3 is a dynamic tiling window manager. Its key features are correct implementation of Xinerama (workspaces are assigned to virtual screens, and it does the right thing when attaching new monitors) and XrandR support (which is still unfinished). Both horizontal and vertical columns can be used in tiling. There is a special focus is on writing clean, readable, and well documented code. i3 uses xcb for asynchronous communication with X11, and has several measures to be very fast. i3 is primarily targeted at advanced users and developers.