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.
Originally writen by Gulshan Singh.
You can find the original tutorial for how to make this display manager here. The tutorial branch more closely follows the tutorial.
This display manager has tested on Debian 8/9x with i3 as the window manager. The window manager must be placed in /etc/X11/Xsession (i.e. it should contain exec i3).