Clara - Clara is a virtual employee that schedules your meetings, getting you to the work that matters, faster.
i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
Mia - Virtual assistant for meetings
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.
Mastermind Manager - Software for running mastermind groups
Openbox - Openbox is a highly configurable, next generation window manager with extensive standards support.