The default configuration is stored in dconf under the schema org.ArcticaProject.arctica-greeter.
Distributions should set their own defaults using a GLib override.
Features
Arctica Greeter is cross-distribution and should work pretty much anywhere.
Arctica Greeter uses Ayatana Indicators for the tray icons, so make sure they are available in your distribution, as well.
This greeter supports HiDPI.
Sessions are validated. If a default/chosen session isn't present on the system, the greeter scans for known sessions in /usr/share/xsessions and replaces the invalid session choice with a valid session.
You can take a screenshot by pressing PrintScrn. The screenshot is saved in /var/lib/lightdm/Screenshot.png.
Credits
Arctica Greeter started as a fork of Unity Greeter 16.04.2, a greeter developed for Ubuntu by Canonical. Furtheron, various improvements are take from Slick Greeter, the LinuxMint fork of Unity Greeter.