Top 6 metatags open source projects

🏷️ Angular module for setting meta/link tags such as open graph, canonical, robots, and title

🧙‍♂️A ProcessWire module helping you to manage SEO related tasks like a boss.

🔍 OpenGraph, Twitter Card and Schema.org snippet tags for Wagtail CMS pages

Phoenix library helps generating meta tags for website.

Inspired/stolen from http://code.lancepollard.com/complete-list-of-html-meta-tags/

SeoTags create all SEO tags you need such as meta, link, twitter card (twitter:), open graph (og:), and JSON-LD schema (structred data).