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.
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.
Privacy.com - Get a new virtual card for every transaction
Openbox - Openbox is a highly configurable, next generation window manager with extensive standards support.
Sift App - Uncover bad network traffic on your phone