Vendora

To add ads to your page or post you can use the shortcode “vendora”. 
E.g.:
<pre><code>[vendora q="iphone" size="12"]
</code></pre>
Or to show your own ads on Vendora:
<pre><code>[vendora user="[YOUR_USER_ID]" size="12"]
</code></pre>
Replace [YOUR_USER_ID] with your Vendora User ID or URL of your public profile.

Vendora Widget

Display ads from Vendora.gr on your own site. Adds a widget and shortcode.

HivePress

HivePress Messages is an extension for <a href="https://wordpress.org/plugins/hivepress/" rel="ugc">HivePress</a> plugin. It allows users to send private messages.
<a href="https://listinghive.hivepress.io/" rel="nofollow ugc">Demo</a> | <a href="https://help.hivepress.io/" rel="nofollow ugc">Docs</a> | <a href="https://community.hivepress.io/" rel="nofollow ugc">Support</a>

Vendora Widget vs HivePress Messages