Customise the way your post/page will be displayed on the major social media through the Open Graph Protocal (OGP).
Add some meta to your terms like tags, categories or custom taxonomies
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.
Easily add custom fields to nav menu items.
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.
Convert custom fields to tags, categories or taxonomy terms
An easy way to add custom fields to your object types (post, pages, custom post types, users)
ScholarPress Coins adds a COinS metadata to your blog posts, which will allow other tools that can read/parse COinS to ingest data about your posts.
Allow your viewers to see the metadata (exif, xml, gps, author, copyright etc.) of the pictures in your posts.
BETA - Populates image description with EXIF data (currently json formated)
Link Counter is a WordPress Plugin that produces a report of targeted links and domains from a blog's posts and pages.
Get Description from Site meta-data
Enhance your site's functionality by querying and sorting posts based on custom field values.
Inserts OWMS metadata as meta tags into all post types. Provides options screen in admin area for setting default values.