i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
Wayland - Wayland is intended as a simpler replacement for X, easier to develop and maintain.
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.
DirectFB - DirectFB is a web-based platform that provides you with complete access to a software library that you can use for the acceleration of graphics, handling the input devices, and others for your Linux operating systems.
Fluxbox - Fluxbox is a window manager for X that was based on the Blackbox 0.61.1 code.
Y Window System - Y Window System is a platform that allows you to improve the speed, working, and efficiency of the application in your operating system and helps you to increase the responsiveness of applications similar to any locally based app.