This is a display/login manager for Linux, similar to GDM, KDM, or SLiM. It is a very simple display manager written in C using GTK3.
This display manager has only been tested on Arch Linux with dwm as the window manager. The window manager must be placed in .xinitrc (i.e. it should contain exec dwm).
You can find a tutorial for how to make this display manager here. The tutorial branch more closely follows the tutorial.