This module integrates with the Clef service, letting users log in with their Android or iOS smartphone. Clef is a smartphone app that lets you "forget your passwords" and log into sites as easily as taking a photo.
The Clef module adds a button to Drupal login forms. If you've already logged into Clef, pressing that button logs you into Drupal automatically. If not, you'll be asked to scan a QR code with the Clef app on your phone.
Drupal users are matched to their Clef identities by email address, so existing users can take advantage of Clef right away. Future versions of the Clef module will support user registration using the Clef app.
The current project page can be found in my sandbox:
The current repository is located at:
git clone --recursive --branch 7.x-1.x git.drupal.org:sandbox/DaveRoss/1923862.git clef
This is a Drupal 7.x project, with plans to port to 8.x as development proceeds.