Meta Box AIO is a package, that allows you to Create WordPress custom fields and meta boxes in any possible combination you can imagine.

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

Easy Meta is simple easy and powerful joomla! extension allows you manages meta data and add semantic data in you website page's head.

Xbox is a complete and powerful framework to create beautiful, professional and flexibles Meta boxes and Admin pages or Theme Options.

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.