As well as metadata providing context of the state of the device when it crashed, Crittercism will give you the steps users took up until the time of the crash to provide even more context.

Open-sourced** - The libraries Crittercism use are open-sourced and released here

Allows you to correlate a crash with the line of code that caused it. dSYM for iOS and Proguard for Android.

Crittercism allows you to communicate directly to the end-user via features such telling users who experienced a crash that it has been fixed by an update.

http://i.imgur.com/AkKkt.png?2

They also have a easily implemented user feedback forum to receive bugs, feature requests or just general feedback from your users without having to leave the application.

http://vator.tv/images/attachments/140711102010crittercism.png

The ability to enable users to communicate crashes or bugs directly to the development team will reduce the number of poor app store reviews.