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.

Tyler Shuster

This is a plugin to manage deployment of WordPress sites to one or multiple servers, whether development, staging or production. Add, remove, push to, or pull from environments under Tools -> Deploy.
Requires: 
rsync 
If using ssh and not the command line, must use key-based authentication
Add the following constants to your wp-config.php or add them via the admin interface.
(ENV can be any name of your choosing for your remote environment)
<pre><code>DEPLOY_[ENV]_DB_HOST
DEPLOY_[ENV]_DB_USER
DEPLOY_[ENV]_DB_NAME
DEPLOY_[ENV]_DB_PORT
DEPLOY_[ENV]_DB_PASSWORD
</code></pre>
* Database dsn for the environment 
* Mandatory: Yes except for port (default 3306)
<pre><code>DEPLOY_[ENV]_SSH_DB_HOST
DEPLOY_[ENV]_SSH_DB_USER
DEPLOY_[ENV]_SSH_DB_PATH
DEPLOY_[ENV]_SSH_DB_PORT
</code></pre>
* If you need to connect to the destination database through SSH (you probably do) 
* Mandatory: No, port defaults to 22
<pre><code>DEPLOY_[ENV]_SSH_HOST
DEPLOY_[ENV]_SSH_USER
DEPLOY_[ENV]_SSH_PORT
</code></pre>
* SSH host to sync with Rsync 
* Mandatory: No, port defaults to 22
<pre><code>DEPLOY_[ENV]_PATH
</code></pre>
* Server path for the environment (used to reconfigure the WordPress database) 
* Mandatory: Yes
<pre><code>DEPLOY_[ENV]_URL
</code></pre>
* Url of the WordPress install for this environment (used to reconfigure the WordPress database) 
* Mandatory: Yes
<pre><code>DEPLOY_[ENV]_EXCLUDES
</code></pre>
* Add files to exclude from rsync. List must be separated buy semicolons. 
* Mandatory: No

WP Deploy Flow

This adds functionality that allows developers to pull or push their entire site or only the files from a variety of remote environments.

Volume Post Sync Manager vs WP Deploy Flow