I have been looking at Saltcorn for this purpose, and it seems quite interesting. I can’t verify it or vouch for it, however.

If I had more time, I would love to play with it and try and build things. But I am pretty busy. So I am also looking at replacing my specialized CRM with something open source and self-hosted.

It’s not pretty, but I will probably settle on Dolibarr as it’s non-American, comprehensive, and there are docker implementations.