Really Good UX - A library of screenshots for UX inspiration
Seolyzer - Seolyzer is the ultimate SEO tool that provides you with all the information you need to improve your website’s health and performance.
Usability.gov - Resource for user experience (UX) best practices & guides
SEOmator - SEO website analysis & audit tool
UX Check - Easy heuristic evaluations on your website (chrome ext.)
Whatsmyserp - Powerful Rank & Serp Tracking. Completely Free.