Sisanu

If you use WordPress MS, the plugin gives you the possibility to copy the content and all related to a specific site created in the WPMS and deploy all that on another application that uses also WordPress MS. This plugin is for site admins (super administrators) of WPMS sites.
The purpose of this plug-in is to allow you to make changes in a “staging” environment and once you decide the site is ready to be published you can choose to deploy it to a “live” environment. Please note that this plugin has to be installed and activated on both application in order to have the deployment functionality.
Bug report, please go here: 
http://www.phpcoder.ro/contact.php
<h3>License</h3>
This program is distributed in the hope that it will be useful, but 
WITHOUT ANY WARRANTY; without even the implied warranty of 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
<h3>Version history</h3>
0.1-alfa First testing alpha version. 
0.2-beta Beta version.

Sisanu Site Deployment

This plugin adds an option page "PHP Site Deployment" under your admin menu. The plugin gives you the possibility to copy the content and al …

We Are Volume

Post Sync Manager lets you move posts between your local, staging, and production WordPress sites with a single click — directly from the Gutenberg editor.
Free features: 
* Push and pull posts, pages, and custom post types between environments 
* Sync status indicator (in sync, remote newer, local newer, conflict) 
* Secret-key authentication between sites 
* Full sync log with pagination
<a href="https://postsyncmanager.com" rel="nofollow ugc">Pro version</a> features: 
* Bulk sync page with per-row push, pull, and status check
<h3>External Services</h3>
This plugin communicates only between your own WordPress sites when pushing or pulling posts. No data is routed through any third-party server.
<ul>
<li>What is sent: post content, post meta, and media attachments belonging to the post being synced</li>
<li>Where it goes: directly to the remote WordPress site URL you configure in Settings</li>
<li>Authentication: requests are authenticated with a secret key you set — no external accounts required</li>
</ul>

Volume Post Sync Manager

Push and pull individual posts between WordPress environments.

Sisanu Site Deployment vs Volume Post Sync Manager