privacyIDEA
Open source
2FA
Open-source MFA server supporting HOTP, TOTP, push, FIDO2, YubiKey and SSH keys
replaces:Authy·Duo Security·Google Authenticator
Germany
DPA EU data Open Self-host
tiqr
Open source
2FA
Open-source mobile authenticator that confirms logins by scanning a QR code
replaces:Authy·Duo Security·Google Authenticator
Netherlands
DPA EU data Open Self-host
Yubico
Paid
2FA
YubiKey hardware security keys for FIDO2, U2F, OTP, smart-card and OpenPGP
replaces:Authy·Duo Security·Google Authenticator
Sweden
DPA EU data