Ryan Welcher

Patrick Rauland

This is a simple WordPress plugin which allows a site adminstrator to limit the number of widgets in a sidebar. You simply go the the settings -> limit widgets page and customize the maximum number of widgets used for each menu.
A nice visual effect will appear in the sidebar in the WordPress admin and the client will be unable to drop new widgets into the sidebar once the cap has been reached.
You can set widgets to have unlimited widgets by leaving the field blank. You can also set the sidebar to have 0 widgets effectively diabling it.
Credits
This is the Internet which means that nothing is created from scratch. This plugin is mostly a combination of work from other people which I just packaged into something with a user interface for easy management.
<ul>
<li><a href="http://wordpress.stackexchange.com/users/8/jan-fabry" rel="nofollow ugc">Jan Fabray</a> on <a href="http://wordpress.stackexchange.com/questions/19907/limit-number-of-widgets-in-sidebars" rel="nofollow ugc">WordPress Answers</a></li>
<li><a href="http://stackoverflow.com/users/821185/aman" rel="nofollow ugc">Aman</a> on <a href="http://stackoverflow.com/questions/6636701/limit-number-of-items-in-sortable-with-draggable-as-source/6663581#6663581" rel="nofollow ugc">Stack Overflow</a></li>
</ul>
Contributors Welcome
<ul>
<li>Submit a <a href="https://github.com/BFTrick/limit-widgets" rel="nofollow ugc">pull request on Github</a></li>
</ul>
Author
<ul>
<li><a href="http://www.patrickrauland.com" rel="nofollow ugc">Patrick Rauland</a></li>
<li><a href="http://www.ryanwelcher.com" rel="nofollow ugc">Ryan Welcher</a></li>
</ul>

Limit Widgets

A plugin for WordPress that limits the number of widgets in a sidebar.

Philipp Speck

With this plugin you can edit sidebar contents like posts in the admin area and assign them from a dropdown menu to any post or page. It supports flexible dropping via widget for independent theme association.
It’s a matter of fact that people don’t want to code when they just want to change their contents. To keep a website interesting for visitors you can change the sidebar contents in context to the main content. Before you could realize it with different sidebar templates or conditional tags. 
Now you can do all these great things inside the admin area without any coding. 
Any anyway: Since we organize informations in databases all contents should be stored there as well.
From a dropdown menu you can easily choose all sidebars you have created.
<h4>Features</h4>
<ul>
<li>Own <code>meta box</code> on post/page edit pages</li>
<li>Own menu item in admin menu</li>
<li>Registrates own <code>post type</code> for sidebars</li>
<li>Full editable sidebars like posts</li>
<li>Assign sidebars from dropdown menu</li>
<li>Flexible widget support</li>
<li>No coding needed</li>
<li>Oldest sidebar as default post</li>
<li>Loads sidebar from parent page if not assigned for children</li>
<li>Localization in English and German</li>
</ul>
<h4>Related Links</h4>
<ul>
<li><a href="http://www.typomedia.org/wordpress/plugins/wordpress-custom-sidebar/" title="Homepage of WordPress Custom Sidebar" rel="nofollow ugc">Homepage</a></li>
<li><a href="https://wordpress.org/extend/plugins/wordpress-custom-sidebar/changelog/" title="Changelog for WordPress Custom Sidebar" rel="ugc">Changelog</a></li>
<li><a href="https://wordpress.org/extend/plugins/wordpress-custom-sidebar/faq/" title="FAQ for WordPress Custom Sidebar" rel="ugc">Questions</a></li>
</ul>
Note: 
First drop the widget in the sidebar of your choice. Now uses oldest sidebar as default sidebar. Before installing or upgrading new plugins, please backup your database first! After upgrading to ‘WordPress Custom Sidebar 2.0’ you have to assign the widget again.

WordPress Custom Sidebar

With this plugin you can handle sidebar contents like posts and assign them from a dropdown menu.

Limit Widgets vs WordPress Custom Sidebar