ManageWP - ManageWP is a service for bloggers, site owners and web based companies helping them manage multiple WordPress sites from one dashboard.
Testimonial.to - Collect video testimonials in the simplest way
InfiniteWP - Manage unlimited https://alternativeto.net/software/wordpress/ sites from a central admin panel.
Trust - Trust lets you easily create online surveys, collect customer video testimonials and reviews, then display them with beautiful widgets on your business websites.
WP Remote - WP Remote provides a single place to monitor and update all of your WordPress sites.
Senja.io - Senja is the easiest way to collect, manage and share testimonials, online reviews and feedback from your customers.