There are a couple excellent reporting frameworks, PLCR and breakpad. What's sorely missing is a really good backend.<p>There's commercial options in crittercism, crashlytics, bugsense, and hockeyapp, but these are either mobile only or subpar in what they provide.<p>And there's really not any decent opensource backend. Mozilla Socorro is ugly and tied to their infrastructure in many ways. The closest I can think of is Sentry... but it's primarily designed for handling tracebacks from backend apps. (Oh, I guess there's also squash.io)<p>Anyway, I'm curious to see what you're building on the backend, and if you intend to opensource it in addition to what you plan to offer commercially.