Backlink Investigation
Ahrefs Site Explorer - http://ahrefs.com/
Majestic SEO - http://majesticseo.com/
Server Investigation
BuiltWith - http://builtwith.com/
Pingdom Full Page Test - http://tools.pingdom.com/fpt/
Google PageSpeed - https://developers.google.com/speed/pagespeed/insights
URI Valet - http://urivalet.com/
SpyOnWeb - http://www.spyonweb.com/
Website Crawling & Link Checking
Screaming Frog SEO Spider Tool - http://www.screamingfrog.co.uk/seo-spider/
Xenu's Link Sleuth - http://home.snafu.de/tilman/xenulink.html
W3C Link Checker - http://validator.w3.org/checklink
Content & Markup Analysis
SEO Browser - http://www.seo-browser.com/
Copyscape - http://www.copyscape.com/
W3C Markup Validation Service - http://validator.w3.org/
Keyword Research
Google Adwords Keyword Tool - https://adwords.google.com/select/KeywordToolExternal
Wordtracker - https://freekeywords.wordtracker.com/
Ubersuggest - http://ubersuggest.org/
Competitive Keyword Analysis
SpyFu - http://www.spyfu.com/
SEMRush - http://www.semrush.com/
Social Discovery
Shared Count - http://sharedcount.com/
SocialMention - http://socialmention.com/
Follower Wonk - http://followerwonk.com/
PR & Outreach
HARO - http://www.helpareporter.com/
Blogger LinkUp - http://www.bloggerlinkup.com/
MyBlogGuest - http://myblogguest.com/
DoubleClick Ad Planner - https://www.google.com/adplanner/
Analytics
Google Analytics - http://www.google.com/analytics/
Search Engine Guidance
Google Webmaster Tools - https://www.google.com/webmasters/
blekko - https://blekko.com/
SEO Analysis
WooRank - http://www.woorank.com/
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