A crash reporter is a software application whose function is to identify report crash details and to alert when there are crashes, in production or on development / testing environments. Crash reports often include data such as stack traces, type of crash, trends and version of software. These reports helps software developers- Web, SAAS, mobile apps and more, to diagnose and fix the underlying problem causing the crashes.
Implementing crash reporting tools as part of the development cycle has become a standard, and crash reporting tools have become a commodity, many of them are offered for free, like Crashlytics.
https://en.wikipedia.org/wiki/Crash_reporter