Hmmm, these don’t really answer the question.
Question (paraphrasing): “Is it possible to sync the Dropbox webfolder with syncthing since there is no official support for FreeBSD from dropbox?”
Answer (paraphrasing): “Install the dropbox client alongside syncthing.”
Dropbox doesn’t work on BSD (any of them) so there’s no client available to install.
So … is there a way to sync files in dropbox to a FreeBSD computer using Syncthing that doesn’t require a separate server running non-FreeBSD? That is the one thing I need to have a BSD-only install.