[rkwz]

Couple of ones I can think of:

Fathom: https://github.com/usefathom/fathom

Goatcounter: https://github.com/zgoat/goatcounter

Freshlytics: https://github.com/sheshbabu/freshlytics

There's also a non-oss but privacy focussed analytics - http://simpleanalytics.com

Disclaimer: I'm the creator of Freshlytics

[gorkemcetin]

You may want to add Countly (for both web and mobile) to that list (https://github.com/countly/countly-server) - which can be deployed on DO easily as well for free (https://marketplace.digitalocean.com/apps/countly-analytics)

[cosmie]

Snowplow is another: https://snowplowanalytics.com/products/snowplow-open-source/