Nextcloud needs to port over some of the old OC Documentation. Their own docs make all kinds of references and it’s always something esoteric.

• Home Assistant
• Minecraft ( gotta go with something like PaperMC server but even core server will run if you setup a drive on USB
• PiHole (but as I commented elsewhere, it’s overkill and you can use Pi Zero’s for this easily).
• OctoPi (3d Printing)

For Pihole it’s probably overkill. I run mine on Pi Zeros.