Umami? (self hosted), see: https://news.ycombinator.com/item?id=24198329

Or it might be worth picking through this thread: https://news.ycombinator.com/item?id=23560823

There are open source analytics you can host.

Free hosting needs to gain something from other sources. Google gets your data. I'd be wary towards other free alternatives, if those exist (eg Yandex Metrica)

Matomo