Website SEO Score Tool
Majestic SEO : Backlink Checker & Site Explorer
PageRank, website value review, page rank stats, keyword seo analytics
Website Traffic Estimates by TrafficEstimate.com
8 Most Important SEO Data Points of Any Website | SEJ
Official Google Webmaster Central Blog: Best practices when moving your site
How to build a bigger website – subdomains or subdirectories? Part 1 | Digital Brand Insider
Majestic®: Marketing Search Engine and SEO Backlink Checker
Attracta SEO Tools & Managed SEO Services
INFOGRAPHIC - How to change website domain name (And keep Google ranking)
SEO Tools - Search Engine Optimization Tools
SEMrush - service for competitors research, shows organic and Ads keywords for any site or domain
Nibbler - Test any website
A guide to redesigning a website without affecting SEO | Search Engine Watch