Vamsi recommended TrackJS. 2 months ago
Sergey recommended Sentry. 2 months ago
Sentry is a log aggregation tool open sourced on GitHub and available as a SaaS at GetSentry.com. Sentry was conceived in 2010 at Disqus and got the first paying customer in Feb...
Supports local variables in stack traces, source maps. Also supports logging from many other languages. Free plan for <5000 events/month.
Raygun keeps a watchful eye on your web and mobile applications and tells you when problems arise