Here are Plugins & Snippets collection of downloads related to Keyword Research. Please have a look if there's any download that could be of help to improve and enhance your Easy Digital Downloads WordPress webstores.
Keyword research is the process of finding and analyzing actual search terms that people enter into search engines. The insight you can get into these actual search terms can help shape your content strategy as well as your overall marketing strategy.

Source: How to Build a Digital Product Marketplace in WordPress - Plugins & Snippets