The original 1930s Enigma with the same logic and a minimalist and modern look. have fun playing around.
You can try it out at here.
Just don't send daily weather reports with it and be careful about who you hail.
You don't need to install enigma-js on your local PC, as its hosted on github. but if you wanted to, you can download the zip version of this projects master branch and extract it on your local computer.
I recommend to you to use serve or some type of static local server utility to open this project up on your browser.
You can change its settings using enigma-js's own GUI or import your friends settings by drag and dropping your friend's settings.json in "Import json" button at the settings.
You can pick 3 rotors from 9 rotors (0,8).
You can set a ring number for each rotor (0,25).
You can add up to 13 plugs which convert 2 letters to each other on plugboard (["ab","cd"] means "a" will be converted to "b", "c" will be converted to "d" and vice verca)
if you're a power user and you know how to play around with JS, navigate to ./js/utils.js and use rotorConstructor function to create your own rotor wire sets.
then you can add the settings that you created as a array of number to ./js/enigma.js>_ROTOR_SETTINGS