fathom - Looks great. I am OK with closed source products (my motivation is self-hosting/privacy) but the direction is not clear to me. Maybe they will have a blog about it at some point - https://github.com/usefathom/fathom/issues/268. Having multiple code bases is going to be super hard.
goaccess.io - this analyses web logs
google-analytics-proxy - project is dead
matomo - this is what i use now and it works great. has a lot of quirks but if you spend some time, you can make it work.
ackee, goatcounter - simple but looks like this does not track users/sessions. it's mostly for page hits.
countly - looks good if you are enterprise. there is no pricing :(
freshlytics (from another thread) - page says it's in beta and not production ready