Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
UptimeRobot - Free Website Uptime Monitoring
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
UptimeRobot App - Web, SSL, ports & Cron-jobs monitoring