The best alternatives to 2FA.link are SimpleID, Instant 2FA, and Bulwark. If these 3 options don't work for you, we've listed a few more alternatives below.
MiniKey is the simplest one time password generator for two-factor authentication. MiniKey lives in your menu bar, and lets you copy generated codes with a click, and drag codes from MiniKey into authenticating apps.
Authenticator generates two-factor authentication (2FA) codes in your browser. Use it to add an extra layer of security to your online accounts. Supports TOTP HOTP Authenticator Extension serves as a drop-in replacement for apps such as Google Authenticator.
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teamFa lets you generate your 2FA codes in Slack with one simple command. You can also share 2FA access with as many people as you want; this is great for teams that used one shared account and want additional security.