The Enigma machine is a rotor machines, a combination of mechanical and electrical subsystems. The mechanical subsystem consists of a keyboard; a set of rotating disks called rotors arranged adjacently along a spindle; one of various stepping components to turn at least one rotor with each key press, and a series of lamps, one for each letter.
See wikipedia
Download the .zip file or clone the directory https://github.com/tangimds/enigma-virtual, and then run the index.html file in your favourite browser.
You can set up Enigma (rotors used, each intial rotor's position, the plugboard) and encrypt your message. Help and hint are available on the interface.
Tangi Mendès