Klout

NutshellMail

Teenvio

MailChimp

HowSociable

SocialBro

Tweetdeck

Hootsuite

Google Keyword Tool

DoubleClick Ad Planner

KISSinsights

Google Website Optimizer

Crazy Egg

ClickTale

Webtrends Analytics

Woopra

KISSmetrics

Adobe Omniture SiteCatalyst

Piwik

Google Analytics

Twitalyzer

SEOmoz Tools

Majestic SEO

Ontolo

Screaming Frog SEO Spider Tool

SEOmoz Open Site Explorer

SEMRush

SEOquake for Firefox

SEO for Chrome

Raven Tools

WooRank

Compete-PRO

Media Metrix Suite comScore

NetView Nielsen

Alexa / Alexa Toolbar

Google Trends for Websites

Google Trends for Search

TweetStats