Not only a Google authenticator for 2-step verification for Java ME enabled phones. This is MIDlet-1.0 implementation of RFC 6238 authenticator - TOTP: Time-Based One-Time Password Algorithm. It's quick, simple and it supports multiple profiles.
pam_mobtok is a PAM module together with a J2ME midlet to realize authentification. A password is entered into the J2ME capable mobile device which then generates a token that is valid for a short time.