SEO Tools Centre provides SEO checker services for websites. Here you will find different types of free SEO tools: plagiarism checker, broken links analyzer and much more for free.
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.
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
UptimeRobot - Free Website Uptime Monitoring
SEO PowerSuite - Get all SEO tools in one pack - download free edition of SEO PowerSuite and get top 10 rankings for your site on Google and other search engines!
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.