Google Authenticator
From Do you speak Drupalish? Featured Drupal wiki-like documentation
You don't have a smart phone
- First, download qrcode-desktop https://code.google.com/archive/p/qrcode-desktop/. This is a Java application that will scan a screenshot for a QR code. Download the ".exe" version if you're on Windows. Then, simply run this application and hit the "Capture Screen" button in the lower-right. Then select the area of the RuneScape page with the QR code. via
