PagerDuty - Cloud based monitoring service
DialMyCalls - The easy to use mass and emergency notification platform. Send a phone call, text message or e-mail to your entire list of people in seconds.
OpsGenie - Alerting and On-Call Management for Dev&Ops Teams
InformaCast - InformaCast is a leading mass notification software solution that helps organizations reach everyone with critical information.
One Call Now - One Call Now's message notification delivers automated phone calls, SMS text messages and emails within moments to any group.
Omnigo - Omnigo ensures a safer tomorrow by delivering security management, incident reporting, and public safety software for law enforcement, education, dispatch, and more