i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
Birch - Find the best credit card for your spending.
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.
Card - Share your contacts and social profiles stupidly easy