Sentry is is an open-source bug tracking platform that monitors the application for crash causes and solutions in real-time. It is easy to set-up and provides real-time alerts whenever a crash takes place. Sentry makes it easy to recreate errors and helps you resolve them faster. It highlights the areas that are most affected to crashes so that you know who's affected even before they know. It is a completely open-source project that is also available as a hosted platform.