Not technically an addon for Elkarte, but an addon for the Mumble voice communication server to allow clients to login with their Elkarte account details. It syncs the user's Elkarte groups to the Mumble server, allowing permissions to be set in Mumble based on Elkarte groups. It can also pull across avatars from Elkarte to display in the Mumble channel list.
It is based on the SMF authenticator here: https://github.com/mumble-voip/mumble-scripts/tree/master/Authenticators/SMF/2.0
Elkarte Authenticator for Murmur: https://github.com/Ant59/mumble-scripts/blob/master/Authenticators/Elkarte/elkarteauth.py
Interesting stuff!
Yup very very cool ... I've just started to play with python again for some Rpi stuff I'm doing, looking at that plug in and dang I've forgotten so much !