i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
Kard - Maximize your credit card rewards & save on every purchase.
awesome - A dynamic window manager for the X Window System developed in the C and Lua programming languages.
Privacy.com - Get a new virtual card for every transaction
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.
Sift App - Uncover bad network traffic on your phone