Best Free SEO Tools

Google Analytics

  • Definitely the most valuable analytics package out there. World-class enterprise grade analytics for free. The first thing you should install.

Google Webmaster Tools

  • This one isn’t optional folks. You have to install Google Webmaster Tools in order to ‘communicate’ with Google about your site.

Bing Webmaster Tools

  • Bing’s version of webmaster tools.

Google Adwords Keyword Tool

  • This is the defacto starting point for your keyword research in SEO. Everything starts here!

SEOBook SEO Tools (These are both free and paid)

  • Check some of these SEOBook tools out.

SEO Site Tools (Google Chrome Plugin)

  • This is a great chrome plugin.

Google Trends

  • Google Trends is a great additional tool to check query volume.

BuiltWith

  • This will show you a number of things going on behind-the-scenes with competitor websites. Server information, CMS systems, frameworks, analytics and tracking, javascript libraries, widgets, aggregation functionality, document information and encoding.

Xenu

  • Find broken links and errors with Xenu.

SEM Rush (SEM Data and Organic Ranking Information)

  • Get a better view of the competitive SERP landscape.

Browseo.net

  • See how search engines view your site with Browseo.

Internet Marketing Ninjas On-Page Optimization Analysis

  • An on-page analysis tool to check internal and external links.

XML Sitemap Generator

  • You can create an XML sitemap here.

Rich Snippets Testing Tool

  • Use this tool to check how Google views your structured data markup. It’s particularly useful if you have a G+ profile and you want to verify authorship for your blog posts.

Virante Duplicate Content Checker

  • Use this to determine wether or not you have duplicate content problems.

Advanced Link Manager

  • Manage your links. This tool is awesome.

Link Research Tools

  • Compiles link data from lots of sources into one dashboard.

Majestic SEO

  • One of the best link explorers in the industry.

Open Site Explorer

  • THE best link explorer in the industry.

Ahrefs

  • A great link analysis tool.