GapDebug - GapDebug is a comprehensive mobile debugging tool that bridges the gap left by other debugging options.
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Bugfender - Cloud logging for your apps, not only crashes matter
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
FBSonar - Sonar is a platform for debugging mobile apps on iOS and Android.
Better Uptime - We call you when your website goes down