Dead Man’s Snitch
▻https://deadmanssnitch.com
The simplest way to make sure your periodic tasks are actually running.
Phone Call, SMS and Email Alerting for Your Monitoring Solution | PagerDuty
▻http://www.pagerduty.com
PagerDuty provides SaaS IT on-call schedule management, alerting and incident tracking.
Add scheduling to existing monitoring solutions
Alert teams via SMS, phone, email or iOS push
Respond or escalate issues via your mobile device
Twilio Cloud Communications - APIs for Voice, VoIP and Text Messaging
▻http://www.twilio.com
Send & receive SMS over regular phone numbers and short codes through a single, simple REST API.