CrashProbe (via Daniel Jalkut):
CrashProbe is a crash reporting test suite presented by HockeyApp that benchmarks and compares popular iOS and Mac OS X crash reporting services. In our effort to ensure the best possible and most accurate crash reports, we created a set of test cases that we use to verify PLCrashReporter and improve HockeyApp.
Landon Fuller highlights a bug it found in Crashlytics that contradicts its marketing.