Here are Plugins & Snippets collection of downloads related to Product Reviews. Please have a look if there's any download that could be of help to improve and enhance your Easy Digital Downloads WordPress webstores.
The Reviews plugin from Easy Digital Downloads makes it quick and easy for your visitors and customers to review the products offered on your website and leave a rating.

[1] How to Build a Digital Product Marketplace in WordPress - Plugins & Snippets

[2] Reviews extension for EDD