Meta Box AIO is a package, that allows you to Create WordPress custom fields and meta boxes in any possible combination you can imagine.
Demo: https://metabox.io
The WP Meta SEO plugin gives you a full control over your WordPress website's SEO with accurate & advanced tools. WP Meta SEO comes with time-saving tools, including: a meta information bulk editor, an image SEO optimization, a powerful XML sitemap generation and a redirect manager.
Demo: https://www.joomunited.com/wordpress-products/wp-meta-seo
Easy Meta is simple easy and powerful joomla! extension allows you manages meta data and add semantic data in you website page's head.
Demo: https://www.joomboost.com/joomla-components/189-easy-meta.html
Xbox is a complete and powerful framework to create beautiful, professional and flexibles Meta boxes and Admin pages or Theme Options.
Demo: https://codecanyon.net/item/xbox-framework-create-meta-boxes-theme-options-admin-pages-for-wordpress/19250995
Wordpress Meta Data & Taxonomies Filter (MDTF) is a plugin for searching and filtering WordPress content - posts and their custom types by taxonomy and metadata fields.
Demo: https://codecanyon.net/item/wordpress-meta-data-taxonomies-filter/7002700