Topher

This plugin provides a metabox on posts and pages listing existing WordPress Menus. The end user is allowed to choose one and make it associated with the post or page via meta data.
Practically speaking, Featured Menus work exactly like Featured Images. The Post or Page and Featured Menu are merely attached, and you must use a template tag or WordPress functions to render the Menu.
Please see <a href="https://wordpress.org/plugins/wp-featured-menus/other_notes/" rel="ugc">Other Notes</a> for examples.
<h3>Usage</h3>
Page or Post meta has a key called <code>_wp_featured_menu</code>. A very simple way to render the menu is like this:
<pre><code><?php
 $meta = get_post_custom();
 wp_nav_menu( array( 'menu' => $meta['_wp_featured_menu'][0] ) );
?>
</code></pre>
A better way might be to test for the value first:
<pre><code><?php
 $meta = get_post_custom();
 if ( is_numeric( $meta['_wp_featured_menu'][0] ) ) {
 wp_nav_menu( array( 'menu' => $meta['_wp_featured_menu'][0] ) );
 }
?>
</code></pre>

WP Featured Menus

Provides a metabox on posts and pages listing existing WordPress Menus.

GuyPrimavera

This open source and lightweight plugin allows users with the role Editor or Shop Manager to access the Menus and Widgets areas of the Appearance menu in WordPress’ admin area.
This is a common task that would be useful for clients to manage themselves to give them more control over their website’s content.
This plugin also gives access to the Customize submenu and other theme options, but these can be hidden through the options page at Appearance > Editor Access if you wish.
You can also select other menus to hide from Editors and Shop Managers (e.g. custom theme or plugin options pages), as well as hiding any elements on the Admin Bar.
Features
<ul>
<li>Allow access to Customize, Menus and Widgets for Editors and Shop Managers.</li>
<li>Theme Options remain hidden from these user roles.</li>
<li>Hide custom options pages from these users (if your theme/plugin has a custom settings page you wish to hide).</li>
<li>Hide any other menus or submenus. Simply select which menus you wish to hide.</li>
<li>Hide admin bar menus and elements. Choose which elements you wish to hide.</li>
</ul>

Editor Menu and Widget Access

Ideal

Allow and control Editor and Shop Manager access to the menus, widgets and appearance menu, plus other menus and adminbar items.

WP Featured Menus vs Editor Menu and Widget Access