Jungle Scout - Amazon product research made easy.
Meta Tags - Meta Tags is a tool to debug and generate meta tag code for any website.
Helium 10 - Our software contains multiple Amazon seller tools to help you find high ranking keywords, identify trends, spy on competitors, & optimize product listings.
Devhints - TL;DR for developer documentation
Reviewbox - E-commerce data tool to monitor customer reviews, track online pricing, optimize AMS tools, and more from Amazon, Walmart, and other major online retailers.
Meta Tag Generator - Generate HTML code optimal for SEO, social media, & mobile.