i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
Headspace - Meditation made simple. Brilliant things happen in calm minds.
awesome - A dynamic window manager for the X Window System developed in the C and Lua programming languages.
Synctuition Meditation Program - Synctuition Meditation Program is a world’s most leading meditation app that comes with brand new 3D sounds that enhance the quality of sleep significantly.
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.
Calm - Calm.com can help you reduce stress and increase calm.