Brian Layman

This plugin allows the creation and display of custom sidebars for any page (or post) on your site. On each page, you can choose which of your current theme’s sidebars will be replaced. The replacement works for all descendants of a replaced page.
In this fashion you can: 
1. Easily create a CMS like site with unique sidebars for every page, even if your theme doesn’t support it. 
2. Create a sidebar with a Cart widget that displays on store pages created by the WP-E-Commerce page, but not anywhere else on the site. 
3. Use parent pages to create themed areas of your site, without creating custom page templates.
This plugin is compatible with every theme and all widgets because it hijacks your theme’s sidebars instead of replacing them.
<h3>Use</h3>
<ol>
<li>Edit a page or create and save one. It must at least have a title.</li>
<li>In the ?Custom Sidebar? section, check ?Activate a custom sidebar? and select the sidebar to replace.</li>
<li>On the Appearance->Widgets screen, place the widgets on the newly created sidebar that matches your post. </li>
</ol>
That?s it. No code. No CSS changes. No custom templates.
This video describes the usage of the plugin: 
 <iframe loading="lazy" class="youtube-player" width="640" height="360" src="https://www.youtube.com/embed/_U2XfrU7nZQ?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>

Per Page Sidebars

The Per Page Sidebars (PPS) plugin allows blog administrators to create a unique sidebar for each Page. No template editing is required.

Jason

NOTE: This plugin requires Theme Blvd framework v2.2.1+
In a nutshell, this plugin provides that infamous “Unlimited Sidebars” feature all the cool kids are asking for with your Theme Blvd theme.
When using a Theme Blvd theme, this plugin will allow to create custom widget areas for any of your theme’s specific widget area locations. Custom widget areas can be created for specific locations and then assigned to pages throughout your website. Additionally, custom widget areas can be left as “floating” (i.e. no location) and then be inserted within dynamic areas such as elements of the <a href="https://wordpress.org/extend/plugins/theme-blvd-layout-builder" rel="ugc">Layout Builder</a>, for example.
Custom widget areas have two attributes to understand when being setup.
<ol>
<li>Location: The location is where the widget area is on the page. Examples would be Right Sidebar, Left Sidebar, Ads Above Content, etc.</li>
<li>Assignments: The assignments are where a particular custom widget area will then be displayed on your website. The assignments can be specific pages, posts, archives, and various other pre-set WordPress conditionals. Additionally, advanced users can input their own custom <a href="https://codex.wordpress.org/Conditional_Tags" rel="nofollow ugc">conditional statements</a> within their widget area assignments.</li>
</ol>
NOTE: For this plugin to do anything, you must have a theme with Theme Blvd framework v2.2+ activated.

Theme Blvd Widget Areas

When using a Theme Blvd theme, this plugin extends the framework's widget area system.

Per Page Sidebars vs Theme Blvd Widget Areas