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Admin Buddy is a modular admin enhancement suite for WordPress. Each feature is an independent module you can enable or disable from the Setup screen. No feature runs unless you turn it on.
Modules included:
<ul>
<li>White Label – rebrand the admin: custom greeting, agency name, sidebar logo, admin bar cleanup, dashboard widgets, hide update nags, footer text, and more</li>
<li>Colours – apply a colour scheme to the entire WP admin, login page, and admin bar</li>
<li>Login – style the WordPress login page with your brand</li>
<li>Maintenance – Coming Soon and Maintenance mode with bypass URLs and emergency access</li>
<li>SMTP – configure outgoing email with multiple provider presets and email logging</li>
<li>User Roles – capability matrix editor with backup and restore</li>
<li>Media Manager – organise the Media Library into nested, colour-coded folders, injected into the native Media Library and every page-builder media modal; drag files to folders, search and sort, and reorganise with a multi-select toolbar; optional two-step Media Trash (trash, restore, empty). Folders are standard WordPress terms, so they survive deactivation</li>
<li>Quick Settings – one-click toggles for common WordPress housekeeping (disable feeds, emojis, XML-RPC, REST API, etc.)</li>
</ul>
<h3>Source Code</h3>
The complete source code is available at: 
https://github.com/360igs/admin-buddy-free
The repository is published on each release and contains the exact files in the WordPress.org-hosted zip.
<h3>External services</h3>
The SMTP module can route outgoing WordPress email through a third-party SMTP server when the site administrator chooses to enable it.
The plugin does not include hardcoded connections to any specific email service. The administrator supplies the SMTP host, port, encryption setting, and credentials in the SMTP module’s settings. No data is sent to any external server until the administrator saves those credentials and an email is dispatched (either by WordPress itself or by the SMTP module’s “Send test email” button).
When email is sent, the recipient address, message body, and any attachments are transmitted to the SMTP server the administrator configured, using the credentials supplied. The plugin neither chooses the destination server nor stores credentials anywhere outside the local site database.
Because the destination is administrator-supplied, no fixed terms-of-service or privacy-policy link applies; the relevant policy is the one published by whichever SMTP provider the administrator chooses.

Admin Buddy

A modular WordPress admin enhancement suite - branding, colours, login, maintenance, SMTP, user roles, media folders, and quick settings.

ryansommers

Slate provides a clean, simplified design for your WordPress Admin area.
Our goal was to simplify the visual design with a primary focus on the content writing experience.
If you like Slate, please consider leaving a review here on WordPress. Thank you!

Slate Admin Theme

This admin theme is particularly well thought for High resolution screens so it’s better than default theme.

Good

A clean, simplified WordPress Admin theme.

Admin Buddy vs Slate Admin Theme