Angelo Rocha

Features: 
– Lists available roles; 
– Add custom roles; 
– Delete custom roles; 
– Permissions based on custom roles; 
– User management; 
– Adds more than one role for a user; 
– Set default role for user without roles; 
– Access to admin menu by role; 
– Auto add role to new users; 
– Show/Hide admin bar to specific roles; 
– Show/Hide Widgets on admin/front to specific roles; 
– Show/Hide individual sidebar widgets to specific roles; 
– Content access by user role;

WPSS Ultimate User Management

This plugin allows efficient management of users, roles and capabilities. Create, edit and delete user permissions faster and easier.

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.

WPSS Ultimate User Management vs Zedna Maintenance Mode