FreeOTP

Two-factor authenticationApache-2.0

Mauth

A Beautiful Two-factor Authentication app.GPL-3.0-or-later

Flauth

Privacy-first, open-source TOTP authenticator for 2FA token management.MIT

Varengold activeTAN

2FA for online bankingGPL-3.0-or-later

Proton Authenticator

Private, secure, offline 2FA across devices by Proton teamGPL-3.0-or-later

Pocket2FA

Secure 2FA code client of 2FAuth server that works offlineAGPL-3.0-only

PasswdSafe

Port of PasswordSafe password managerArtistic-2.0

mOTP

One-time password generatorApache-2.0

KeePassVault

Client app for KeePass databasesApache-2.0

ANOTHERpass

Another way to manage passwords (password manager and 2FA authenticator)MIT

Tokn - MFA / 2FA authenticator

Open-source 2FA authenticator. Encrypted on-device. No accounts.GPL-3.0-or-later

Blockstream App (Green)

Bitcoin - secure and easyGPL-3.0-only

SimpleLogin | Anti-spam

Protect your email inbox with a secure and open source solution by SimpleLoginApache-2.0

FreeOTP+

Two-factor authenticator (2FA) with one-time password protocols (OTP)Apache-2.0

BluePass

BluePass extracts 2FA tokens from SMS and forwards them via BluetoothMIT

KeePassDX Passkey Vault

Manage Passkey / Password in a local and open-source vaultGPL-3.0-or-later