disinfor

A text widget based on the default WordPress text widget. Allows users to add custom classes to the widget container and the title tag.
It takes this: 
<h3 class=”widget-title”>
And allows you to do this: 
<h3 class=”widget-title custom-class custom-class-2 etc”>
It also allows users to add custom classes to the widget container.
NEW 
If the sidebar registration in your theme’s function file does not contain any HTML for before or after the title of the widget, this now will now fill that with an <code><h4></code> tag set.
<h3>General Information</h3>
This plugin is absolutely free to use. I made it for a specific personal purpose and decided to share with everyone else. I will try and update this for the future but can’t guarantee.

Text Widget with Class

A text widget based on the default Wordpress text widget. Allows users to add custom classes to the widget container and the title tag.

Aiken1

Simple plugin that adds extra functionality to menu items. The plugin will allow to set predefined CSS classes (Select field) to menu items. 
Support for the plugin “If Menu”: https://wordpress.org/plugins/if-menu/ – does not break the “If Menu” plugin.
Example of defining CSS classes for menu items is in the “FAQ” tab here.
Custom Menu Class is 100% free. if you have questions or need additional information u can comment on my website ( http://deving.de – http://deving.de/blog/wordpress/2292-wordpress-plugin-fuer-voreingestellte-css-klassen-fuer-menue-links/ ) or in the “Support” tab here.
Check out my <a href="http://themeforest.net/user/Aiken1/portfolio?ref=Aiken1" title="Themeforest" rel="nofollow ugc">Themeforest Account</a>

Text Widget with Class vs Custom Menu Class