This one isn’t optional folks. You have to install Google Webmaster Tools in order to ‘communicate’ with Google about your site.
Bing’s version of webmaster tools.
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.
This is a great chrome plugin.
Google Trends is a great additional tool to check query volume.
Find broken links and errors with Xenu.
Get a better view of the competitive SERP landscape.
See how search engines view your site with Browseo.
An on-page analysis tool to check internal and external links.
You can create an XML sitemap here.
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.
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.
ClickMinded SEO Certification – Learn more about the ClickMinded SEO Individual Qualification