Keytunity mines your Google Search Console data, together with crawls of your website to produce new, unique keyword recommendations.
These suggestions include content add-ons and new topic ideas designed to grow your site traffic.
The top open-source alternatives to Keytunity
are GetKeywords.io.
One of the criteria for ordering this list is the number of mentions that products have on reliable external sources.
You can suggest additional sources through the form here.