KaeruCT

This plugin allows passwords for password-protected pages/posts to be passed directly through the URL.
The query string parameter that should contain the password is <code>pw</code>.
For example, if the URL of your post is <code>http://myblog.com/password-protected-page/</code> and the password is <code>PASSWORD</code>, 
then just append <code>?pw=PASSWORD</code> to it.
If the URL already contains a query string (for example, <code>http://myblog.com/?p=5</code>), then be sure to append <code>&pw=PASSWORD</code> instead.

Password Passthrough

This plugin allows passwords for password-protected pages/posts to be passed directly through the URL.

Sebastian Weiß

Lightweb Media Basic Authentication is a plugin for protected your development WordPress site like .htpasswd. 
The Plugin supported an localhost bypass for the wp-cli and an mu-plugin creation for Rollbacks.
Features:
<ul>
<li>Easy for setting Basic Authentication</li>
<li>Basic Authentication works like .htpasswd</li>
<li>Protected development website or demo website without .htpasswd</li>
<li>Support Docker and Kubernetes (K8s)</li>
<li>The plugin is lightweight.</li>
<li>Create mu-plugin for rollbacks</li>
<li>Allow Bypassing for localhost (for WP-CLI)</li>
</ul>

Lightweb Media Basic Authentication

Lightweb Media Basic Authentication for protected your development WordPress site like .htpasswd

Password Passthrough vs Lightweb Media Basic Authentication