i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
Hero - Hero offers student behavior management applications for K-12 schools.
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.
Workgroups DaVinci - Project management and workflow automation software for marketing and creative teams.
Openbox - Openbox is a highly configurable, next generation window manager with extensive standards support.
AdvancePro - Fully integrated supply chain management software