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You can look into http://userjoy.co. You can find the details at https://github.com/savinay/userjoy

Snowplow seems good for collecting event-data. But what about the Dashboard UI for analyzing Retention, Querying & Segmentation, Retroactive funnel analysis, etc? Collecting the data is one thing but what makes something like mixpanel great is the dashboard.

Is there a client you can put on top of snowplow that gets you the same dashboard as mixpanel?

It's not open source but you could use Ms Power BI for visualising the data

It might be worth looking at: http://piwik.org/

Ask HN: Open-source mixpanel?