mobileOTP is what you are looking for: http://motp.sourceforge.net/ http://motp.sourceforge.net/ it supports a number of OTP flavours (OATH-HOTP, OATH-TOTP, m

mobileOTP is what you are looking for: http://motp.sourceforge.net/ http://motp.sourceforge.net/ it supports a number of OTP flavours (OATH-HOTP, OATH-TOTP, mOTP etc.). GOOG and others also provide OATH apps, ie: http://f-droid.org/repository/browse/?fdfilter=OTP http://f-droid.org/repository/browse/?fdfilter=OTP all FLOSS and work with standard services. If you prefer a hardware token, inexpensive Yubikey tools come with every Linux distribution.