TransIP, a hoster in the Netherlands, has a free offering called STACK: free cloud storage for 1000 GB! It took me a few days to get an invite to activate it. It’s based on Owncloud, and they made branded clients. That means there are clients for phones and tablets, and every OS (including Linux!). In addition, you can mount the drive through WebDAV too. It’s reasonable fast, and you can store your Dropbox many times over in there. I’m a fan.