Site Down - Site down outage and downtime reports from SiteDown.co
cutestat - Website Stats and Valuation. CuteStat.
Is it Down? - Is it down can check if a website is down or is it just your PC that can not access it.
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.
UPDOWNtoday - UPDOWNTODAY allows you to check whether the website is down or not.
Site Worth traffic - Site Worth traffic is a cost-effective site that is introduced to estimate the value, daily page views, daily visitors, and daily revenue of a website.