Meteor.link - Retarget anyone who clicks on your links.
Ahrefs Backlink Checker - With the world's biggest index of live backlinks (over 15 trillion), Ahrefs Backlink Checker will show you the most complete backlink profile for any website.
JustReachOut - A tool to help you pitch to journalists and press daily all on your own.
Whatsmyserp - Powerful Rank & Serp Tracking. Completely Free.
Postaga - Generate more backlinks and social shares with effective, automated post promotion and outreach.
Backlink Tool - A backlink tool to index your links quickly and freely.