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.

Rafael Oliveira

DynaSide creates dynamic sidebars that adapt to each page
No more generic sidebar content. 
DynaSide (Dynamic Sidebars) gives you full control over widget areas, allowing you to create truly contextual sidebar experiences on a page-by-page basis.
<h4>Why choose DynaSide?</h4>
<ul>
<li>Precision: Display relevant content tailored to each individual page</li>
<li>Simplicity: Intuitive interface, no coding required</li>
<li>Security: Built following WordPress coding standards and best practices</li>
<li>Flexibility: Create and manage unlimited sidebars</li>
<li>Compatibility: Works seamlessly with any properly built WordPress theme</li>
</ul>
DynaSide is ideal for websites that need to show different sidebar content depending on context, such as promotions on product pages, forms on contact pages, or contextual widgets in articles.
<h4>Key Features</h4>
<ul>
<li>Bulk Creation: Create multiple sidebars at once by separating names with commas.</li>
<li>Edit and Reorder: Rename sidebars with a single click and reorder them easily using drag-and-drop.</li>
<li>Per-Page Assignment: Assign a sidebar directly from the page editor via a dedicated sidebar panel.</li>
<li>Bulk Page Assignment: From the plugin panel, search and select multiple pages to associate them with a sidebar in one action.</li>
<li>Backup and Restore: Export all sidebars and page assignments to a JSON file and import them on another site or as a backup.</li>
<li>Access Control: Destructive actions such as “Reset” and “Delete Sidebar” are restricted to specific administrators only.</li>
<li>Safe and Reliable: Uses nonces, sanitization, and proper capability checks.</li>
<li>Fully Internationalized: 100% translatable and available in English and Portuguese.</li>
</ul>
<h3>Getting Started</h3>
<h4>Method 1: Page Editor (Fastest)</h4>
<ol>
<li>Edit a page and locate the “Dynamic Area” panel in the editor sidebar.</li>
<li>Select the sidebar you want to display on that page.</li>
<li>Save or update the page.</li>
<li>Done! If you need a new sidebar, the panel provides a direct link to the plugin management page.</li>
</ol>
<h4>Method 2: Plugin Management Panel</h4>
After activation, a new “Sidebars” menu will appear under Appearance.
<ol>
<li>Create Areas: Enter one or more sidebar names separated by commas (e.g., “Contact Sidebar, News Sidebar”) and click “Create new area”.</li>
<li>Select Pages: In the “Assign Pages” field, start typing a page title or slug and select it. Repeat as needed.</li>
<li>Assign: Choose the desired sidebar from the dropdown and click “Assign Pages”.</li>
<li>Add Widgets: Go to <code>Appearance > Widgets</code> or click the provided shortcut link to start adding widgets.</li>
</ol>

DynaSide – Dynamic Sidebars per Page

Create dynamic sidebars and assign widgets per page using an intuitive editor panel or a centralized management screen.

Limit Widgets vs DynaSide – Dynamic Sidebars per Page