SNIP is an innovative Structured Data and Schema plugin for WordPress that creates Rich Snippets and Rich Search Results.
Demo: https://codecanyon.net/item/snip-structured-data-plugin-for-wordpress/3464341
Google Structured Data Pro is an SEO Joomla extension that allows digital marketers to adopt Google Structured Data and Rich Results - Cards without requiring them to be an expert in the Schema.org language or writing code.
Demo: https://www.tassos.gr/joomla-extensions/google-structured-data-markup
Schema Premium is a WordPressplugin that comes with features to add schema.org structured data markup in JSON-LD format, most recommended by search engines such as Google.