Heap Analytics -- https://heapanalytics.com

And I run everything through Segment rather than embedding individual trackers directly. Segment either relays data to other services or loads required JS on page load.

The long term solution is usually building an in-house analytics service but it's not easy and cheap. We're also developing a generic analytics platform that can be installed with one-click to your favorite cloud provider so that you can store your event data in your database and build an internal analytics service without coding. Check out: https://github.com/rakam-io/rakam

https://piwik.org isn't bad, but last time I checked it was blocked in ublock origin just like GA

https://goaccess.io — simply awesome

It is actually easy to implement GA-like functionality in JS, send the event data to the server, and process it e.g. daily. You can start slowly, e.g. track only clicks (make it sync), visit time and scroll (both async).

Of course my homegrown analytics reporting is far from Google's, but at least I have found a great balance between getting useful usage data on my sites, and at the same time respecting the visitors' privacy.

Keen IO is a great alternative. Full disclosure, I'm a product manager at Keen. That said, we do help some of our customers move off of GA to gain more control and flexibility in their analytics

https://piwik.org seems to be the go-to open source solution.

piwik or just grep your nginx logs.

For commercial sites a solution like Adobe marketing cloud (nee Omniture) is an option

Snowplow