Paul Irish has a list of alternatives at https://plus.google.com/+PaulIrish/posts/12BVL5exFJn, but I really don't think any of them compare to this (TrackJS). So while I think everyone should be doing client-side reporting and evaluating all the options, I suspect TrackJS just brought this to another level (think awstats vs Google Analytics)

I use sentry, and it doesn't provide anything really like the timeline feature.