1. Rollbar collects errors that happen in your application, notifies you, and analyzes them so you can debug and fix them. Ruby, Python, PHP, Node.js, JavaScript, and Flash libraries available.

  2. Detect and diagnose crashes in your applications. Bugsnag's cross platform error monitoring helps you ship with confidence.

  3. We monitor the software that makes your customers happy.

  4. Exception, uptime, and performance monitoring for Ruby.

  5. Open-source error tracking that helps developers monitor and fix crashes in real time. Iterate continuously. Boost workflow efficiency. Improve user experience.

  6. Airbrake is the leading exception reporting service, currently providing error tracking.

  7. Raygun gives developers meaningful insights into problems affecting their applications. Discover issues - Understand the problem - Fix things faster.

  8. Stackdriver provides monitoring services for cloud-powered applications.

  9. Application monitoring for developers