VPNs, proxies, encrypted email, anonymous SIM cards, and privacy services.

https://2fas.com
Free, secure, open source authenticator app for iOS and Android with encrypted backups and browser extension.

https://getaegis.app
Free, secure and open source authenticator app for Android. Supports TOTP and HOTP with encrypted vault exports.

https://ente.io/auth
Free, open source app for storing and generating 2FA TOTP tokens with end-to-end encrypted cloud sync.

https://tofuauth.com
Easy-to-use, open-source two-factor authentication app designed specifically for iOS. Never connects to the internet.