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Sentry.io - From error tracking to performance monitoring, developers can see what actually matters, solve quicker, and learn continuously about their applications - from the frontend to the backend.
BugSnag - Not all bugs are worth fixing. Prioritize and fix software bugs that matter while improving software stability with every release.
TrackJS - JavaScript Error Tracking for Modern Web Applications
Rollbar - 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.
Firebase Crashlytics - The most powerful, yet lightest weight crash reporting solution for iOS and Android developers. | Crashlytics
HoneyBadger - Exception, uptime, and performance monitoring for Ruby.