Authenticator

Bitwarden Authenticator generates verification codes for two-factor authentication, ensuring your identity is verified when you log into accounts.

Duo Mobile works with Duo Security's two-factor authentication service to make logins more secure. The application generates passcodes for login and can receive push notifications for easy, one-tap authentication.

WinAuth is a portable, open-source Authenticator for Windows that can be used as a 2FA including Bitcoin / crypto-currency websites, any service that requires the Google Authenticator, and games such as World of Warcraft, Diablo III, Guild Wars 2, Rift, ArcheAge.

Generates, stores, and encrypts two-factor authentication tokens, enables secure backup, offers offline access, multi-device sync, and flexible import/export options.

Stratum (formerly Authenticator Pro) is a community-backed open-source project which aims to provide privacy and security to users. The source-code is auditable by anyone on GitHub and released under the GPL 3.0 license.

Native open-source app for iOS and macOS generates time-based one-time passwords, supports secure iCloud sync, FaceID unlock, QR scanning, and encrypted backup.

Google Authenticator generates 2-Step Verification codes on your phone.

Aegis Authenticator is a free, secure and open source app to manage your 2-step verification tokens for your online services.

It can only be used 100 times each month for free.

2FAS Authenticator is a simple and free application for Two Factor Authentication (2FA Authentication) which generates Time-based One-time Passwords (TOTP) and PUSH authentication*.

Sign in is easy, convenient, and secure when you use Microsoft Authenticator. Use your phone, not your password, to log into your Microsoft account. You simply have to enter your username, then approve the notification sent to your phone.