[johnradon]

ahrefs.com - Backlink Checker & SEO Report
antranks.com - Search Engine Keyword Rank Tracker Online
authoritylabs.com - Accurate and reliable search engine ranking data and keyword insights
cognitiveseo.com - SEO Tools to Increase Your Traffic
getstat.com - unlimited serp tracking: made for folks who really know seo.
moz.com - SEO Software, Tools, Resources for Smarter Marketing
relgrowth.com - Free Google Sheets SEO tools w/ affordable PRO editions
semrush.com - All-in-one Marketing Toolkit for digital marketing professionals
seranking.com - All-Inclusive cloud-based SEO software
serpstat.com - Growth hacking tool for SEO, PPC and content marketing
spyserp.com - absolutely accurate free search engine ranking checker
Desktop software:

cuterank.net - Keyword Rank Checker
link-assistant.com - Rankings, on-page, backlinks, and reports — all in one easy-to-use toolkit