Support Hero - Educate your customers through self-help support
statuspage - A simple self-hosted status page site with an API written in Django under the BSD license.
HelpSite - HelpSite is a simple service to help your setup the perfect support centre or help site.
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.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
UptimeRobot - Free Website Uptime Monitoring