Whatsmyserp - Powerful Rank & Serp Tracking. Completely Free.
Linkody - Save time and money by managing your SEO linkbuilding with Linkody.
SEOmator - SEO website analysis & audit tool
Backlinks by Neil Patel - A backlinks research tool for competitive intelligence
Panguin Tool by Barracuda Digital - See your website's Google organic visit data overlaid with Google's major algorithm updates and changes to easily identify the impact on your website. Technology by Barracuda Digital.
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters