[jrcii2]

This might be an interesting alternative: https://github.com/QingWei-Li/notea.

Open source Notion clone that you can host locally.

[TobTobXX]

Looks awesome, but it relies on an S3 (or compatible) backend, which I personally find too much of a hassle.

[sbarre]

Min.io[0] is pretty easy to set up, if you haven't heard of it, and is S3-compatible.

0: https://min.io/