Android: If you're like me, you hoard whatever cloud storage you can get. Cloudii makes it simple to manage all of your different storage options in one place.
The app connects with Dropbox, Drive, Box.net and Skydrive. You can view and manage your files, set syncing schedules and backup your account setups so it's easy to switch devices. The app is free for the first 14 days, but you'll be asked to pay a fee to continue using it. However, the developer says that "it doesn't matter how much you pay", so it sounds like it's donationware with a one-time licence fee.