Sentry
Open-source error tracking that helps developers
Screenshots

Hunter's comment
Are you a software developer and have trouble commiting error tracking for software that you are developing? Waiting for an error report from the end user is sometimes too long and can be fatal to the software.
Sentry is an open source error tracking application that will help you a developer to monitor and correct crashes that occur in real time.
Features
- Right away find out about exceptions
- Quickly find and fix production errors
- See the impact of each release
- The power of community for error tracking
The motto is...
Seriously though, stop hoping your users will report bugs.
(Source)
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