kengher

Broadcast simple, important alerts across your multisite network. Also great for single sites.
Features of Site Alert: 
* Display alert(s) in the Homepage with option to show in all pages of a site. 
* Native WordPress WYSIWYG message creation box for simplicity with media support. 
* Choice of hardcoded at the different parts of the page, or make it a pop-up modal. 
* Indicate different priority levels (colors) and icons. 
* Set a date range to publish/unpublish the alert.
Features as a Network Admin 
* Show alert across all all sites in your multisite network. 
* Exclude alert(s) from certain sites. 
* Site Groups manager to provide easier bulk exclusions.

Super Simple Site Alert

Broadcast simple, important alerts across your multisite network. Also great for single sites.

Abu Hayat

bPlugins

Charles Cormier

Md. Merajul Islam Sojib

Create and display notices/alerts on the page using the Gutenberg block. it comes up with a few customizable options to design the alert box as you want. Improve the user experience of your website using this block plugin.
<a href="https://bblockswp.com/demo/alert" rel="nofollow ugc">Demos</a>
<h4>Features</h4>
<ul>
<li>Fully Customizable: Lots of options available to make the alert box as you want!</li>
<li>Different Types: Alert box block comes with different types, you can easily switch the type of alert box.</li>
<li>Standard Preset: Some preset alerts/notices are ready to use without any modification. </li>
</ul>
<h4>How to use</h4>
<ul>
<li>First, install the Alert Box Block plugin</li>
<li>Add the Alert Box Block from the block category called “Widgets” in the Gutenberg editor.</li>
<li>You can change block settings from the right-side settings sidebar.</li>
<li>
Enjoy!
</li>
<li>
For installation help click on Installation Tab
</li>
</ul>
<h4>Feedback</h4>
<ul>
<li>Did you like this plugin? Dislike it? Do you have a feature request? <a href="mailto:support@bplugins.com" title="Send feedback" rel="nofollow ugc">Please share your feedback with us</a></li>
</ul>
<h3>Check out the Parent Plugin of this plugin-</h3>
<a href="https://bblockswp.com" rel="nofollow ugc">B Blocks</a> – A blocks collection and page building tool for Gutenberg.
<h3>Check out our other WordPress Plugins-</h3>
<a href="https://bplugins.com/products/html5-video-player/" rel="nofollow ugc">Html5 Video Player</a> – Display videos as single and playlist in multiple skins.
<a href="https://bplugins.com/products/pdf-poster/" rel="nofollow ugc">PDF Poster</a> – Display/Embed PDF files with different styles.
<a href="https://bplugins.com/products/html5-audio-player/" rel="nofollow ugc">Html5 Audio Player</a> – Listen audios with awesome visuals.
<a href="https://bplugins.com/products/streamcast-radio-player/" rel="nofollow ugc">StreamCast</a> – Customizable radio player with different skins.
<a href="https://bplugins.com/products/3d-viewer/" rel="nofollow ugc">3D Viewer</a> – Embed 3D models and 3D products with interaction.
<a href="https://bplugins.com/products/advanced-post-block/" rel="nofollow ugc">Advanced Post Block</a> – Show posts and custom posts in different layouts.

Alert Box Block – Display Custom Alerts and Messages

It's Very useful and handy for Gutenberg lover.

Super Simple Site Alert vs Alert Box Block – Display Custom Alerts and Messages