Ryan Street

Show or hide content with a simple to use shortcode system. You can access or restrict content for:
<ul>
<li>Logged in/out users</li>
<li>different user types, (author, administrator, etc.)</li>
<li>different user roles and capabilities</li>
<li>URL Keys</li>
<li>password entry (good to show teasers, etc)</li>
<li>show/hide clickable links</li>
</ul>

Content Lock

Show or hide some or all of your content by wrapping it in convenient shortcodes!

Radek Mezulanik

You can lock whole website by setting it under maintenance.
Features:
<ul>
<li>
Select roles who applies maintenance mode
</li>
<li>
Set a redirect to login page
</li>
<li>
Edit a maintenance message in wysiwyg editor including media
</li>
</ul>
<h3>Sponsorship</h3>
<a href="https://www.productboard.com" rel="nofollow ugc">Productboard</a>

Zedna Maintenance Mode

Set you website under maintenance to lock content while development.

Content Lock vs Zedna Maintenance Mode