chertz

Quickly add Pages, Posts, or any custom post type posts to any of your menus while you are editing the post. Check the checkbox for the menu to add a menu item to, save, and then go to the admin menu page to see the new menu item.
On the edit page, down along the side is a ‘Add to menu’ box that has a list of the menus you have setup with checkboxes. If the post has already been added, then the checkbox is checked and disabled. If it has not been added to the menu, you can check the checkbox and save the post to add it. Afterwards, go to the Menu admin page to move (if wish) and publish the new menu item.
You can control which post types get the box by going to the ‘Settings > Add to menu’ page.
If the post type has hierarchal structure (such as parent Pages), this will try to place the new menu item underneath a menu item that links to an ancestor post (if menu item exists).

Add to Menu

Quickly add Pages, Posts, or any custom post type posts to any of your menus while editing the post.

Saurabh

Allows you to add Widgets in WordPress Navigation Menus via a custom widget area and an extra box in menu edit screen.
<blockquote>
Warning
You will need to have some CSS skills for the widgets to display properly in nav menus.
</blockquote>
<h4>Usage</h4>
<a href="https://wordpress.org/plugins/widgets-in-menu/screenshots" rel="ugc">View the screenshots</a> for usage instructions.
<h4>Source code and Contributions</h4>
<a href="https://github.com/yapapaya/Widgets-In-Menu-for-WordPress" rel="nofollow ugc">Fork on Github</a>
Contributions are always welcome
<h4>Documentation</h4>
<ul>
<li>Most documentation is inline.</li>
<li>The hooks (actions and filters) are documented in the <a href="https://wordpress.org/plugins/widgets-in-menu/other_notes/" rel="ugc">Other Notes</a>.</li>
<li>Some useful stuff is in the <a href="https://wordpress.org/plugins/widgets-in-menu/faq/" rel="ugc">FAQ section</a>.</li>
</ul>
<h3>Hooks</h3>
<h4>Actions</h4>
yawp_wim_pre_callback
Fires before a widget’s display callback is called. Similar to ‘dynamic_sidebar’ action.
Parameters
<ul>
<li>$yawp_wim_widget array An associative array of widget arguments.
<ol>
<li>string $name Name of the widget.</li>
<li>string $id Widget ID.</li>
<li>array|callback $callback When the hook is fired on the front-end, $callback is an array containing the widget object. Fired on the back-end, $callback is ‘wp_widget_control’, see $_callback.</li>
<li>array $params An associative array of multi-widget arguments.</li>
<li>string $classname CSS class applied to the widget container.</li>
<li>string $description The widget description.</li>
<li>array $_callback When the hook is fired on the back-end, $_callback is populated with an array containing the widget object, see $callback.</li>
</ol>
</li>
</ul>
<h4>Filters</h4>
yawp_wim_attribute_prefix
Filters the prefix used in class/id attributes in html display.
Parameters
<ul>
<li>$default_prefix string The default prefix: ‘yawp_wim’</li>
</ul>
yawp_wim_widget_params
Filter the parameters passed to the widget’s display callback. Similar to ‘dynamic_sidebar_params’ filter
Parameters
<ul>
<li>$params array
<ol>
<li>array $args An array of widget display arguments.
<ol>
<li>string $name Name of the sidebar the widget is assigned to.</li>
<li>string $id ID of the sidebar the widget is assigned to.</li>
<li>string $description The sidebar description.</li>
<li>string $class CSS class applied to the sidebar container.</li>
<li>string $before_widget HTML markup to prepend to each widget in the sidebar.</li>
<li>string $after_widget HTML markup to append to each widget in the sidebar.</li>
<li>string $before_title HTML markup to prepend to the widget title when displayed.</li>
<li>string $after_title HTML markup to append to the widget title when displayed.</li>
<li>string $widget_id ID of the widget.</li>
<li>string $widget_name Name of the widget. }</li>
</ol>
</li>
<li>array $widget_args An array of multi-widget arguments.
<ol>
<li>int $number Number increment used for multiples of the same widget.</li>
</ol>
</li>
</ol>
</li>
</ul>
yawp_wim_no_widgets_message
Filters the html displayed if no widgets are present in the sidebar.
Parameters
<ul>
<li>$no_widgets_output array The default output</li>
</ul>

Widgets in Menu for WordPress

Allows you to add Widgets in WordPress Navigation Menus

Add to Menu vs Widgets in Menu for WordPress