Service - Customer service issues solved for you, on demand, for free.
UptimeRobot - Free Website Uptime Monitoring
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
StatusPage.io - StatusPage.io is the best way for web infrastructure, developer API, and SaaS companies to get set up with their very own status page in minutes. Integrate public metrics and allow your customers to subscribe to be updated automatically.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
FreshStatus - Better status pages in 1-click, FREE FOREVER