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Aegis Authenticator is recommended for privacy-conscious users, open-source enthusiasts, and anyone seeking a feature-rich 2FA solution without the need for commercial software.
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
FreeOTP - Open source implementation of the two-factor authentication HOTP and TOTP schemes.
Authenticator - Authenticator is a simple, free, and open source two-factor authentication app.
Authy - Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.
andOTP - andOTP is a two-factor authentication App for Android 4.4+
Raivo OTP - Raivo OTP is an open-source two-factor authentication app that lets you create a one-time password for your online accounts.