Pretty icons for categories, tags, and other taxonomy terms
Click a button in wp-admin to force an Open Graph rescrape.
PixFields offers you a nice interface to add custom metadata into your favorite post type.
Powerful AJAX-based search alternative which supports faceting queries by taxonomies, terms, location, and post metadata.
Automatically add <link>, <meta> description and <meta> keywords to your HTML on a per-post (or page) basis.
Extend Post and Page data with all related meta data.
This plugin display a Creative Commons banner below your posts in WordPress. All metadata included.
Blocks users from "pinning" pages from your WordPress site on the Pinterest social media site.
Ratings: clean, lightweight and easy
This plugin provides integrated navigation for your website. Use WordPress as a CMS for your website and think in navigation terms (main, sub etc.)
Edit SEO tags (or any custom field) from the All Posts page. Auto-detects SEO plugins & themes.
Media Metadata Workflow Wizard: Integrate your media metadata workflow with WordPress's Media Library
Customise the way your post/page will be displayed on the major social media through the Open Graph Protocal (OGP).
Simple Open Graph adds Open Graph meta data to the header
A WordPress plugin to provide an object oriented and clean API for creating custom meta-boxes on wp-admin *post_type* add/edit screens.
Metadata SEO integration.
A simple utility plugin for changing or deleting post or user meta (custom fields) keys in bulk.
Scriblio enables faceted searching and browsing of WordPress posts, pages, and custom post types.
WP Term Metadata Plugin for retrieving and manipulating metadata of term objects.
Simple SEO is a quick way to add HTML meta tags to your site and pages using WP integrated custom fields feature.
Allows a user to add dublin core metadata (of their choice) to a wordpress post.
Add App Links to your website to make app-to-app linking possible
This plugin allows you to add facebook open graph protocol to your blog
Adds Open Graph Protocol meta to the individual pages and posts of your WordPress Install.
AlchemyTagger analyzes your writing as you blog, suggesting useful tags to describe and categorize your posts.
A versatile Swiss Army Knife for extraction and processing of IPTC, EXIF and other image metadata.
Advanced Export/Import (WordPress) Object Users: Make a full user backup, restore wherever you want!
Simple but complete SEO Pack to make your site SEO Friendly. Quick way to add meta tags to your post and pages using WP custom fields.
Allows you to include information from an Omeka installation on the same site as a subdomain on pages in WordPress in your WordPress theme.
Provide a framework for assignment of user-object relationship metadata.