To allow analytics opt-out is on the roadmap for 2023Q3

You can make a fork, disable analytics and make your own build. We plan to make smooth anlytics opt-out later this year.

Here is their github with repos

https://github.com/anyproto

Those are client libraries, not server

Here we are https://github.com/anyproto/any-sync

I don't think Notion has formulas for tables. I think you mean formulas for databases.

The formulas for databases like Notion has is actually the second-most requested feature right now and is tagged as Acknowledged, so hopefully we will get it soon.