I'm surprised never seeing any reference to MoneyManager Ex[1] in these threads. I've been using it for a year, syncing my database with Syncthing (as you do with GNUcash) and it's simply awesome. It's more aimed towards personal finances though, as it uses single-entry accounting.

Still, highly recommend. Open-source, all platforms, polished, active development.

[1] https://moneymanagerex.org/