Powerful  Open Source alternative. Unlike competing two-factor/two-step authentication applications out there  FreeOTP Authenticator is not only completely Open Source  but it is developed by one of the very biggest and most trusted names in the Open Source Community  Red Hat! FreeOTP Authenticator works well - except for the fact that codes are cut-off in portrait orientation (something rectified by a switch to landscape orientation) - and has no obvious bugs... Very highly recommended  as is two-factor/two-step authentication itself.
August 12 2015