Rage Grade by FullStory - Benchmark your customer frustration
cutestat - Website Stats and Valuation. CuteStat.
DevDojo - Dev tools and resources for building awesome stuff
Rankchart - Rankchart is one of the unique websites that allows you to examine your websites or watch competitors and locate rich information about website technologies, site reputation, errors, SEO, and ad-word recommendations.
Hey Meta - Quickly check, improve and generate your website's meta tags
WebsiteOutlook - WebsiteOutlook is an all-in-one website that provides you detailed information on famous websites based on various data sources like traffic, page rank, and estimated ad revenue.