Maxaud

(NOTE: Before saying this plugin is broken, please understand what this plugin does. It’s meant for WordPress installs that have multiple NETWORKS.)
Adds the ability to have different themes available to different NETWORKS in a multisite atmoshpere.
WordPress allows for multiple “networks”, these are not to be confused with sites. A network holds blogs underneath of it.
This plugin will allow you to separate themes into different directories so they’re only accessable and viewable to the networks you choose.
The plugin will attempt to create a directory in the /wp-content/ directory named /ms-themes/. If it fails to create it, then you will need to make one.
In the /ms-themes/ directory you will create a folder for each network that you want to allow only certain themes to.
Example: 
If you have a theme named “Snarfer Theme”, and you want to only allow it to be viewable/available to the network (and all sites on that network) with the site_id of 7, you would place the snarfer theme directory in /wp-content/ms-themes/7/
Future releases:
<ul>
<li>Network option to turn off auto creation on/off network directories, index.php files.</li>
<li>Network option to display network ID in the footer of sites so network admins can easily tell what network a site is under.</li>
</ul>

Multisite Themes

Adds the ability to have different themes available to different NETWORKS in a multisite atmoshpere.

Unioney

MassPost is the ultimate tool for editors, publishers, and agencies managing multiple WordPress websites. 
Instead of copying content across sites, you can publish a post once and automatically syndicate it to as many target websites as you like.
<h3>Why Choose MassPost?</h3>
<ul>
<li>Publish Once, Share Everywhere – Write your post once and send it to all your websites with a single click. </li>
<li>Keep Your Content Consistent – Categories, tags, featured images, and formatting are preserved across all sites. </li>
<li>Stay Organized – When you delete a post, it’s automatically removed from all connected sites. </li>
<li>Save Time – Edit posts faster with Quick Edit support right from your posts list. </li>
<li>Schedule Ahead – Set a future publish date and it syncs perfectly across all your websites. </li>
<li>Protection Built-In – Your sites communicate securely with password-protected connections. </li>
<li>Only Send What Changed – MassPost is smart enough to skip posts that haven’t been modified, keeping things fast. </li>
<li>Your URLs Stay the Same – Post links (slugs) remain consistent, making it easier for readers to find content. </li>
<li>Content Images Sync – Images embedded in your post content are automatically downloaded and hosted locally on each target site.</li>
</ul>
MassPost streamlines content distribution, keeps your network of sites consistent, and saves countless hours of manual work.
<h3>Requirements</h3>
<ul>
<li>WordPress 6.0 or higher </li>
<li>PHP 7.4 or higher (works with PHP 8.0 → 8.4) </li>
<li>WP-Cron (or real cron) enabled </li>
<li>Standard PHP extensions: cURL, OpenSSL, DOM </li>
<li>512 MB+ PHP memory recommended if running many feeds with AI</li>
</ul>
Best practice for performance 
For the smoothest AI processing and zero-maintenance cron execution, we recommend hosting your WordPress site on <a href="https://ihost.eco" rel="nofollow ugc">ihost</a> WordPress Cloud Hosting. See FAQ Recommended hosting for an ihost-optimised <a href="https://wordpress.org/plugins/masspost/#suggested%20php%20directives" rel="ugc">php.ini</a> template you can copy-and-paste.

MassPost – Post, Share, Send to Several Websites

Publish once, distribute everywhere. MassPost securely pushes WordPress posts, all formats, images, categories etc to multiple sites.

Multisite Themes vs MassPost – Post, Share, Send to Several Websites