Seebz

Improve Page Permalinks. 
This plugin just adds .html to the permalink pages when needed. 
An option can prevent this action for specific pages.
<h4>Example</h4>
<ul>
<li>yourblog.com/page.html</li>
<li>yourblog.com/parent/</li>
<li>yourblog.com/parent/child.html</li>
</ul>
<h4>Compatibility</h4>
Not tested yet with all previous 3.0 WordPress version
Tests OK with the following plugins
<ul>
<li><a href="https://wordpress.org/extend/plugins/permalink-redirect/" rel="ugc">Permalink Redirect</a> (v2.0.4)</li>
<li><a href="https://wordpress.org/extend/plugins/cms-tree-page-view/" rel="ugc">CMS Tree Page View</a> (v0.6)</li>
</ul>

Improved Page Permalinks

Improve page permalinks by adding ".html" for final pages

athlan

Plugin allows to use post’s custom fields values in permalink structure by adding <code>%field_fieldname%</code> rewrite tag.
Examples:
<ul>
<li><code>http://example.com/%field_event_date_from%/%postname%/</code></li>
<li><code>http://example.com/post-type/%field_event_date_from%/%postname%/</code> (with <a href="https://wordpress.org/plugins/custom-post-type-permalinks/" rel="ugc">Custom Post Type Permalinks</a> plugin)</li>
</ul>
You can also set different permalink structure depending on custom post type using <a href="https://wordpress.org/plugins/custom-post-type-permalinks/" rel="ugc">Custom Post Type Permalinks</a> plugin. You can create own post types by using <a href="https://wordpress.org/plugins/custom-post-type-ui/" rel="ugc">Custom Post Type UI</a> plugin.
The plugin works for:
<ul>
<li>posts</li>
<li>pages</li>
<li>custom post types</li>
</ul>
Plugin is also available on GitHub: 
<a href="https://github.com/athlan/wordpress-custom-fields-permalink-plugin" rel="nofollow ugc">https://github.com/athlan/wordpress-custom-fields-permalink-plugin</a>

Custom Fields Permalink 2

Plugin allows to use post's custom fields values in permalink structure by adding %field_fieldname%, for posts, pages and custom post types.

Improved Page Permalinks vs Custom Fields Permalink 2