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.

breely

Fill your schedule, grow your business. 
Breely is the most flexible platform allowing you build the exact appointment scheduling, forms, and workflows for your business.
Breely offers 1:1 appointment scheduling, group classes, workshops, and class series scheduling. 
You can also create forms, waivers, and more. This plugin allows you to embed the forms 
created in Breely into your WordPress site.

Breely

Embed Breely appointment booking and forms into your site.

Text Widget with Class vs Breely