Name Type Description
Autometa Plugin Creates meta tags "keywords" and "description" on-the-fly if these tags are not found in the page metadata field. Keywords are taken from Search module. Description includes first characters of the page content.
Meta Max Module This module is intended to make adding additional OpenGraph, Dublin Core and standard meta tags along with Google Analytics really simple. It also has the ability to specify descriptions and keywords and used in conjunction with SitemapMadeSimple gives you a good SEO base. It can also be used to generate Doctype and Head tags, replacing the entire head of your document simplifying the inclusion of tags like Apple meta tags and X-UA-Compatible tags.
SEOTools2 Module This is a fork of the SEOTools module that had some issues with CMSMS 1.10+. Major differences are 'under the hood' so the UI will be familiar to those who've used SEOTools in the past. The module enables easy admin of keywords, meta descriptions, sitemap.xml and robots.txt files.