Optimizely - A/B testing you'll actually use.
Q-Stats - Get free marketing insights for every question on Quora.
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
Seoxan - check seo report for any website, alexa ranking, server information, meta tags, authority, page speed and more
Chartbeat - Chartbeat shows you real-time traffic to your website and allows you to set alerts for any downtime or spikes in traffic.
HypeStat - HypeStat is free statistics and analytics service, where you can find information about every website.