moz.com/researchtools/ose

Open Site Explorer is Moz's Search Engine for Links. Perform competitive link research, explore backlinks, anchor text, and more for free.

tools.seochat.com/tools/page-link-analyzer-seo/

The Internal /  External Backlink Analyzer Tool reviews any webpage and provides a cumulative list of outbound links. The tool also alerts the user of any links that do not contain anchor text.

www.internetmarketingninjas.com/seo-tools/seo-compare/

Find all the ways keyword text is used on webpage with this invaluable tool. The Side-by-Side SEO Comparison Tool compares two sites in a side-by-side report. You can quickly see see how your page and a competitor’s page use keywords, how much text i ...

microdatagenerator.org

Great little tool for generating schema.org tags for a local business. Just fill out a few forms and copy/paste the HTML. Easy to use Microdata Generator for adding Schema.org tags to your site.

siteexplorer.search.yahoo.com

Use this site to submit your site and sitemap to Yahoo search engine. You can also see indexed pages. This is also Yahoos version of webmaster tools.

www.bing.com/toolbox/webmasters/

Bing webmaster tools from microsoft. Useful information on indexed pages and traffic sent without the use of any plugin. Not as advanced as Googles but useful.

This has definately improved since it was orginally started.

www.google.com/webmasters/tools/

Google Webmaster Tools provides you with detailed reports about your pages' visibility on Google.

This is the orginal webmaster tool.

www.i18nguy.com/markup/metatags.html#copyr

These are the HTML Meta Tags that I find useful or interesting. I am not intending to document all possible Meta Tags here. Check the references for more detail and other Meta Tags. 

code.lancepollard.com/complete-list-of-html-meta-tags/

This is a complete list of META tags

googlewebmastercentral.blogspot.com/2007/03/using-robots-met...

This is a basic reference for using the robots META tags

www.davecain.co.uk/blog/seo-question-length-title-descriptio...

The title tag should be know longer than 66 characters and the description tag should be know longer than 140 – 160 characters.

This article gives some more background and suggestions.

moz.com/community/q/can-i-place-h1-tag-anywhere-on-page

My question is.  Can I place the H1 tag anywhere on the page?  I have some tabs like below.  I am thinking of add a tab in between delivery and returns called more info and placing more seo keywords including the H1 tag in this tab.

top7business.com/?Top-7-Meta-Tag-Suggestions-to-Improve-Sear...

In this article, we simply talk about what Meta Tags are, their importance, the important Meta Tags and useful tips on how to optimize your Meta Tags for a better ranking with the search engines.

yoast.com/robots-meta-tags/

The meta robots tags you can have on your pages has been around for quite a while. Search engines have slowly been adding features to it. This page lists an overview of all the different values you can have in your tag.

www.bytefive.com/search-engine-optimization/meta-description...

ByteFive provides 6 useful tips for creating Meta Description in your pages.

www.iacquire.com/blog/18-meta-tags-every-webpage-should-have...

The definitive guide to Search and Social Meta Tags you should be using in 2013. No fluff, no wasted code, just what you need to use.