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.
Textalyzer - Analyze text readability and SEO parameters
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Dareboost: Website Speed Comparison - Check how fast your website is against your competitors
Better Uptime - We call you when your website goes down
Ubersuggest - Want more traffic? Ubersuggest shows you how to win the game of SEO. Just type in a domain or a keyword to get started.