athenaofdelphi

Virtual Sidebar is a plugin by Christina Louise Warne (aka. AthenaOfDelphi). It is designed to allow users to include widgets in post content by way of ‘virtual’ sidebars. Each virtual sidebar can have widgets added to it using the widget manager and can then be included in a post using the short code [vs id=””].
For detailed information about this plugin and how it works, check out it’s wiki page at <a href="http://athena.outer-reaches.com/wiki/doku.php?id=projects:wpvs:home" rel="nofollow ugc">Athena’s Wiki</a>.
<h3>License</h3>
Virtual Siderbar, a plugin for WordPress, (C) 2010-12 by Christina Louise Warne, is licensed under the <a href="http://www.gnu.org/licenses/gpl.html" title="GNU General Public License" rel="nofollow ugc">GNU General Public License</a>.
Virtual Sidebar is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
Virtual Sidebar 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. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with Virtual Sidebar. If not, see <a href="http://www.gnu.org/licenses/" title="GNU General Public Licenses" rel="nofollow ugc">http://www.gnu.org/licenses/</a>.

Virtual Sidebar

The Virtual Sidebar plugin allows you to create 'virtual' sidebars that can have their content inserted into posts using shortcodes.

alxuta

By using this plugin you’ll be able to allow only a specific number of visitors to navigate through your website. 
The extra influx of visitors will be kept in a virtual queue until a new space will be available.
You could always use the following shortcode [virtual-queue-position], in order to display the current user position into the queue.
Installation
<ol>
<li>Upload the <code>virtual-queue</code> directory to the <code>/wp-content/plugins/</code> directory</li>
<li>Activate the plugin through the ‘Plugins’ menu in WordPress</li>
<li>Update the plugin settings</li>
<li>Set a Cron Job that will access the link https://domain.com/virtual-queue/maintenance/ where domain.com is your own domain name.</li>
<li>Go to Settings -> Permalinks / Permalink Settings and click Save Changes</li>
</ol>

Virtual Queue

By using this plugin you'll be able to allow only a specific number of visitors to navigate through your website.

Virtual Sidebar vs Virtual Queue