Plugin

MOZ | SEO Toolbar for Firefox & Chrome

Web Design » SEO

chrome plugin

old https://moz.com/tools/seo-toolbar

Free.vApp

searchmetrics | Unique SEO, Backlinks & Social Analytics

Web Design » SEO

old http://suite.searchmetrics.com/en/research

I have an account (custom password)

Free.vApp

SEMrush | Service for competitors research

Web Design » SEO

old http://www.semrush.com/