PyTyle is described as 'extremely versatile and extensible tiling manager that is meant to be used on top of EWMH window managers. Its feature set was modeled after the basic tiling features of XMonad' and is a Window Manager in the OS & Utilities category. There are more than 25 alternatives to PyTyle for a variety of platforms, including Linux, BSD, Mac, Windows and FreeBSD. The best alternative is i3, which is both free and Open Source. Other great apps like PyTyle are Openbox (Free, Open Source), awesome (Free, Open Source), Sway (Free, Open Source) and Xmonad (Free, Open Source).
CLFSWM is a highly dynamic. 100% Common Lisp X11 window manager. By default there is only one frame (the root frame). Other frames are created/deleted on the fly. A window can be in more than one frame, so it can have multiple views of the same windows.
StumpWM is a tiling, keyboard driven X11 Window Manager written and scriptable in Common Lisp. StumpWM attempts to be customizable yet visually minimal. There are no window decorations, no icons, and no buttons.
Heavily Inspired by i3wm. Wmderland aims to simplify the core functionalities of i3wm, and bundle in the essential features required for a modern but minimal Tiling Window Manager. Written in C++ using Xlib.
Windawesome (pronounced - contrary to what you would expect from the way it is written - Windows-om, not Wind-awesome) is a highly customizable tiling/dynamic window manager with multi-monitor support for Windows, which works on top of explorer.exe and not as a shell replacement.
subtle is a manual tiling window manager with a rather uncommon approach of tiling: Instead of relying on predefined layouts, subtle divides the screen into a grid with customizeable slots (called gravities).