i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
Xmonad - xmonad is a dynamically tiling X11 window manager that is written and configured in Haskell.
dwm - dwm is a dynamic window manager for X. It manages windows in tiled, monocle and floating layouts. All of the layouts can be applied dynamically, optimising the environment for the application in use and the task performed.
qtile - Qtile is a full-featured, hackable tiling window manager written in Python.
PaperWM - Tiled scrollable window management for Gnome Shell - paperwm/PaperWM
awesome - A dynamic window manager for the X Window System developed in the C and Lua programming languages.