i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
SmartWindows.app - Auto arrange all your app windows, whether on one screen or many with a single click!
Wayfire - Wayland compositor with 3d effects.
SANeForce - SAN Pharma Sales Force Automation
Openbox - Openbox is a highly configurable, next generation window manager with extensive standards support.
ReIcon - ReIcon is portable freeware that enables you to save and restore your desktop layout.