Yubico Authenticator

Yubico Authenticator is an application that generates OATH one-time codes (TOTP and HOTP) for two-factor authentication from credentials stored on a YubiKey. The YubiKey's secure element holds those credentials, and they can't be extracted once stored. You can add accounts by QR code or by entering the secret key manually. You can also protect the YubiKey's OATH application with a password.