Open – The unofficial WordPress Plugin Directory

Open Graph Headers for WP

This plugin allows you to add open graph meta tags to your WordPress website.

Add Pinterest Rich Pin data to WooCommerce Product Pages via WordPress SEO by Yoast

Opens all the links (URLs) added in the comments and author URL, in a new tab or window.

Define and optimize what the Facebook crawler should pick up and show when people share your content.

This plugin allows you to easily open and close your website and display a custom message or HTML page when closed.

OpenStreetMaps for Events Manager. An add-on to replace Google Maps with OpenStreetMap. 0% Google, 100% open source.

Opens external links in a new window, keeping your blog page in the browser so you don't lose surfers to another site.