SEOTrack - Compare website traffic vs SEO changes done at the same time
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Monkey Test It - Primate powered algorithms that scan your site for common bugs and SEO mistakes.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
Better Uptime - We call you when your website goes down