Typora - A minimal Markdown reading & writing app.
i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
StackEdit - Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.
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.
MarkText.app - Mark Text is a Markdown editor for Mac, Windows and Linux.
Openbox - Openbox is a highly configurable, next generation window manager with extensive standards support.