Not exactly the same feature set, but I’ve replaced Dropbox with Syncthing (open source) and it has been very reliable for my intended use (sync files across my devices).
I also run it on my home server for a central sync point. Don’t use it much on mobile, but works well enough if I do need a file. Not a good solution for sharing with others though.
I also run it on my home server for a central sync point. Don’t use it much on mobile, but works well enough if I do need a file. Not a good solution for sharing with others though.