popularsizzle

A two-step verification plugin using the Time-based One-time Password Algorithm (TOTP), which can be used with an app or service like Google Authenticator.
<ul>
<li>Lightweight and fast: no classes are instantiated until required</li>
<li>No reliance or affiliation with any third-party service</li>
<li>No setup or config required: immediately enabled for all uses upon plugin activation</li>
<li>Automatically throttles multiple failed login attempts</li>
<li>Uses filters to allow modifying functionality or output</li>
<li>Requires PHP 7 or later</li>
<li>Built for WordPress 4.8 or later</li>
</ul>

Simple 2FA

A lightweight, zero-config TOTP 2FA plugin with automatic rate limiting. PHP 7 and WP 4.8 or later.

token2

Token2 helps you proctect your WordPress site from hackers using simple two-factor authentication.
You can get your free API key at <a href="https://www.token2.com/manage" rel="nofollow ugc">www.token2.com</a>.
Plugin development is found at Token2.com

Token2 Two Factor Authentication

Review1

Protect your WordPress site with Token2 two-factor authentication

Simple 2FA vs Token2 Two Factor Authentication