Brooke.

Daryl L. L. Houston (dllh)

Delete posts, pages, links, tags, and categories from your blog with one admin tool rather than having to handle deletion of all of these as separate actions.
Select from post types and tick a box to determine whether or not to delete tags, categories, and links. A javascript prompt will keep you from submitting by accident.
Users must have the “Manage Options” capability in order to use this.

Empty Blog

Created with developers in mind, this plugin allows you to easily delete posts, tags, and categories.

Pothi Kalimuthu

Auto Maintenance Mode plugin is suitable for development sites, such as dev.example.com, test.example.com or staging.example.com. This plugin should NOT be used on a production site. Auto Maintenance Mode plugin can be easily installed to show a maintenance mode page automatically when you are away from your development site or when you log out.
The plugin does not require any additional configuration or setup. All you need to do is activate it and maintenance mode will be automatically enabled when you don’t do anything in your site for a pro-longed period (60 minutes at the moment). It is very lightweight yet powerful. It uses the HTML5 layout which makes the maintenance mode page viewable from a mobile device.
If you are looking for a maintenance mode plugin for a production site, you may consider <a href="https://wordpress.org/plugins/simple-maintenance/" rel="ugc">simple maintenance plugin</a>.
<h4>Features</h4>
<ul>
<li>Clean HTML and CSS layout</li>
<li>Responsive maintenance mode page</li>
<li>No customizations required</li>
<li>Easier to manage as the maintenance mode is activated automatically when you are away from your site</li>
</ul>

Auto Maintenance Mode

Display a maintenance mode page automatically while you are away from your development or staging site.

Empty Blog vs Auto Maintenance Mode