Once installed on top of a Linux distro, Cozy turns a Droplet into a personal app platform. It allows users to easily host basic applications like a contact manager, a calendar, a webmail and a filebox on their own server. It comes with an Android app and a CalDAV/CardDAV server that allow you to sync your contacts, calendars and files with your mobile and your tools.
We think that the personal cloud use case is something that might interest the Digital Ocean users. So, if you like that idea, vote for it!