ryanve

Access is a simple scalable plugin to control user access via the <a href="https://codex.wordpress.org/Taxonomies" rel="nofollow ugc">taxonomy API</a> and user <a href="https://codex.wordpress.org/Roles_and_Capabilities" rel="nofollow ugc">roles/capabilities</a>/IDs. It creates an Access taxonomy whose terms can be used on any post type to restrict access. Term slugs can match a role, capability, or user ID.
<ul>
<li><a href="https://github.com/ryanve/access" rel="nofollow ugc">Usage documentation</a></li>
</ul>

Access

Control content access via a taxonomy that accepts user IDs, roles, or capabilities.

Radek Mezulanik

You can lock whole website by setting it under maintenance.
Features:
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<li>
Select roles who applies maintenance mode
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<li>
Set a redirect to login page
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<li>
Edit a maintenance message in wysiwyg editor including media
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<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.

Access vs Zedna Maintenance Mode