User:Marco Maske

Code-generating authenticator apps:
Time-based One-time Password Algorithm (TOTP) client for (Android) phone or tablet. My recommended apps from F-Droid - The Free and Open Source Android App Repository:
 * andOTP (Android)
 * FreeOTP+ (Android) - Pay attention to the '+' plus. FreeOTP is out of date.

FIDO U2F hardware authenticators:
U2F is more secure and easier to use than TOTP & because I'm lazy and want to log in with one finger touch I'm using 2FA USB Security keys. «Security-Token» German Wiki Wikimedia currently only supports TOTP but the secret from andOTP or FreeOTP+ can be imported into an OnlyKey. OnlyKey has 24 universally programmable slots and I use it for all websites that do not yet support U2F USB tokens. NitroKey Pro has 3 HOTP, 15 TOTP and 16 Password slots. Other nice Open Source USB tokens:
 * NitroKey formerly known as Crypto Stick from German Privacy Foundation e.V. (Open source hardware and software & No U.S./NSA backdoors)
 * The tiny SOMU (CrowdSupply), SOMU & SOLOKeys (Open source hardware and software & No U.S./NSA backdoors)
 * 2FA and hardware password manager: Signet & Signet HC (CrowdSupply), Signet & Signet HC (Open source hardware and software)
 * Hardware wallet, 2FA and hardware password manager: Trezor (Open source hardware and software & No U.S./NSA backdoors)
 * OpenSK make your own 2FA developer key
 * CryptoTrust GitHub
 * Nitrokey GitHub
 * SoloKeys GitHub
 * Signet GitHub
 * Trezor GitHub
 * OpenSK GitHub