bkolbay

This small plugin adds a simple LocalBusiness schema, in JSON-LD notation, to the header of the site. 
An additional “Business Schema” page is created in the WP Settings area that consists of simple form fields to populate the schema.

AW Schema

Adds a simple LocalBusiness schema to the header of the site.

Travis Ballard

Powerful Testimonial Management. Create and use custom Output Templates anywhere on your site. Use the shortcode, function, or included widget to display your testimonials to your users.
This plugin lets you manage testimonials as a separate type of information in your WordPress blog, which makes it easier to include them in other blog posts and pages.
Less technical description by Jacob Share 🙂

TBTestimonials

Powerful Testimonial Management. Create and use custom Output Templates anywhere on your site. Use the shortcode, function, or included widget to disp …

AW Schema vs TBTestimonials