Apparently the source is available for the community edition, although I guess it is full of Linuxisms.psearch onlyoffice
www/onlyoffice-documentserver Secure office and productivity apps
But no client for FreeBSD ... you could try linux emulator ... at own risk ...
help.nextcloud.com
I'd sooner have everyone with LibreOffice to a shared FTP NAS driveI saw it with a glance: some friends installed NextCloud + OnlyOffice on a regular gaming PC from 2022. With more than 10 users, everything ran so slowly that they had to move everything to an expensive server with fast SSD drives and an HP RAID. This setup will only work well on powerful hardware.
Does NextCloud offer anything that can't be done with separate apps?