1. Rollbar
   1. https://rollbar.com/
   2. Catch errors before your users do
   3. Rollbar provides real-time exception reporting and continuous deployment monitoring for developers
2. Raygun
   1. https://raygun.com/
   2. Successful software starts here
   3. Error, crash and performance monitoring software For Web & Mobile Apps
3. Sentry
   1. https://sentry.io/welcome/
   2. Stop hoping your users will report errors
   3. Open-source error tracking that helps developers monitor and fix crashes in real time. Iterate continuously. Boost efficiency. Improve user experience.
4. OverOps
   1. https://www.overops.com/
   2. Log Files Suck
   3. Answering the speed vs quality challenge with OverOps and Software Reliability
5. Airbrake
   1. https://airbrake.io/
   2. No more searching log files
   3. Capture and track your application's exceptions in 3 minutes
6. BugSnag
   1. https://www.bugsnag.com/
   2. Balance agility with stability
   3. Bugsnag monitors application stability, so you can make data-driven decisions on whether you should be building new features, or fixing bugs.
7. StackHunter
   1. https://stackhunter.com/
   2. Troubleshoot Bugs Fast
   3. StackHunter alerts you to failures in your apps and provides the details in one place for you to troubleshoot.
8. VBATelemetry
   1. https://www.vbatelemetry.com/
   2. Application & Usage Monitoring for VBA
   3. Track Events, Errors & Metrics from around the world
9. Appenlight
   1. https://getappenlight.com/
   2. Performance, exception, and uptime monitoring for the Web
   3. We keep an eye on your applications and notify you about performance issues and errors.
10. Source
    1. https://www.smartspate.com/free-tools-for-tracking-application-code/