Ahrefs - Ahrefs is a toolset for SEO and marketing. We have tools for backlink research, organic traffic research, keyword research, content marketing & more. Give Ahrefs a try!
Site Rank Data - View historical rank information of websites via time series charts.
OnCrawl - OnCrawl is a SEO crawler and log analyzer that helps you improve your SEO performance. Increase traffic, rankings & revenues. Start your 14-day free trial.
Q-Stats - Get free marketing insights for every question on Quora.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Seoxan - check seo report for any website, alexa ranking, server information, meta tags, authority, page speed and more