A simple application which generates TOTP tokens when multi-factor authentication is used with your Google account. It implements RFC4226 (HMAC-based OTP) and has been tested to work with Google Authenticator, Dropbox, Dreamhost and Amazon.
Not just to secure your GMail account, but also extremely helpful to tighten the security of your SSH connection as instructed at http://www.mnxsolutions.com/security/two-factor-ssh-with-google-authenticator.html
No data is transmitted. All token secrets are stored locally in localStorage. Online version available at http://gauth.apps.gbraad.nl Community created application. Not affiliated with Google.