
Google Authenticator
Google Authenticator generates 2-step verification codes on your phone. Enable 2-step verification to protect your account from hijacking by adding another layer of security.
Open source implementation of the two-factor authentication HOTP and TOTP schemes.
freeotp is a twofactor authentication application for systems utilizing onetime password protocols with support for ?android (3.0 or later) and ?ios (7 or later). tokens can be added easily by scanning a qrcode or by manually entering in the token configuration.
freeotp implements open standards. this means that no proprietary serverside component is necessary: use any serverside component that implements these standards. we personally recommend ?freeipa, which uses totp. however, any standardscompliant implementation will work. currently, freeotp provides implementations of ?hotp and ?totp.
Multiple Account support Community based Two factor authentication
Productivity Games Utilities Security
multiple-account-support community-based two-factor-authentication totp rfc6238 hotp rfc4226