Bugsnag is an error-monitoring tool that allows your developers to identify, prioritize and replicate bugs in a time-efficient and enjoyable manner. Bugsnag creates an ownership mentality with all developers by enabling them to proactively see the effects of their code. This helps them address issues before these escalate, creating a joyful experience for both customers and engineers.

Self-hosted and cloud-based application monitoring that helps software teams see clearer, solve quicker, & learn continuously.

Rollbar provides real-time error tracking & debugging tools for developers. JavaScript, PHP, Ruby, Python, Node.js, Android, iOS, Apex & more languages supported

Hound is the GitHub code review tool the thoughtbot team wanted but never got, so they built it. You can use it too. Now checking Ruby, JS, Swift, CoffeeScript, Go, Elixir and more.