[aerique]

The German branch of Seafile: https://seafile.de/en/products/

I switched all my data (about 250Gb) to them from Dropbox a couple of months ago and it has worked out well enough.

Features:

- servers not based in the US

- encryption

- privacy

- open source (thanks lima)

- multiple libraries (like multiple separate Dropbox folders)

- nice file manager for unsynced (parts of) libraries

- price

- payment options (Bitcoin)

- supports more OSes

- one can run one's own server

Cons vs Dropbox:

- syncing problems not always obvious

- some UX issues

- photo support

- selective sync cumbersome (if not using libraries)

- no LAN sync

[lima]

And Seafile is open source, too.