jeremyHixon

Gives theme developers and their users a convenient dropdown menu to preview the themes currently installed on the site as well as providing a download link for the one currently selected.
There is an options page in the admin section that allows you to:
<ul>
<li>Choose which themes are available in the select menu</li>
<li>Change the label text for the select menu</li>
<li>Enable/disabled the <a href="https://wordpress.org/plugins/easy-digital-downloads/" rel="ugc">Easy Digital Downloads</a> support.</li>
<li>Enable/disabled the bar globally. If disabled globally, enable on pages/posts.</li>
<li>Enable and disable the default stylesheet</li>
<li>Add custom content to the bar</li>
</ul>

Rational Theme Server

Plugin for theme developers to preview and serve downloads of their themes.

jfinch3

helderk

Peter Hardy-vanDoorn

This plugin lets you specify a maintenance mode message or HTML page for your site and configure settings to allow specific users to bypass the maintenance mode functionality in order to preview the site prior to public launch.
It also disables the WordPress REST API while maintenance mode is active, ensuring that site data remains inaccessible during maintenance.
Any logged in user with WordPress administrator privileges will be allowed to view the site regardless of the settings in the plugin. The exact privilege can be set using a filter hook – see FAQs.
The behaviour of this can be enabled or disabled at any time without losing any of settings configured in its settings pane. However, deactivating the plugin is recommended versus having it activated while disabled.
Functionality to exclude pages from maintenance mode, so only the selected pages will be visible.
When redirect is enabled it can send 2 different header types. “200 OK” is best used for when the site is under development and “503 Service Temporarily Unavailable” is best for when the site is temporarily taken offline for small amendments. If used for a long period of time, 503 can damage your Google ranking.
A list of IP addresses can be set up to completely bypass maintenance mode. This option is useful when needing to allow a client’s entire office to access the site while in maintenance mode without needing to maintain individual access keys.
Access keys work by creating a key on the user’s computer that will be checked against when maintenance mode is active. When a new key is created, a link to create the access key cookie will be emailed to the email address provided. Access can then be revoked either by disabling or deleting the key.
This plugin allows four methods of notifying users that a site is undergoing maintenance:
<ol>
<li>They can be presented with a message using WordPress’s wp_die() function which is core function of WordPress, which makes this plugin feel and work as a part of WordPress core.</li>
<li>They can be presented with a message on a page created with the style of the current template.</li>
<li>They can be presented with a custom HMTL page.</li>
<li>They can be redirected to a static page or external URL.</li>
</ol>

Maintenance Mode

Existem milhares de plugins de este tipo mas são todos ou demasiado complexos ou com falta de funcionalidades.
Este plugin tenta ser simples e funcional, ideal para developers.

Um plugin simples e funcional


This minimalist plugin can display a customisable message indicating the site is temporarily unavailable and return a 503 status code. It’s a great tool for routine maintenance without any unnecessary distractions or features.


Just what I needed, without all the unnecessary complexity or feature bloat

This plugin is intended primarily for developers that need to allow clients to preview sites before being available to the general public or to tempor …

Rational Theme Server vs Maintenance Mode