If you have audio files (podcasts or music) on your Dropbox, you can play them directly on your desktop using the Clementine music player.
Installing Clementine is easy:
$ sudo apt install clementine
Open Clementine, choose Internet in the left bar. Choose Dropbox and follow the dialog to authenticate with Dropbox which it does by opening a browser window. After you allow Dropbox to use this application, Clementine indexes all the audio files in your Dropbox and categorizes it by artist in the left bar. You can choose to add all of them or a specific artist or album to playlist by right-clicking on the item. Enjoy playing music from your own personal cloud! 🙂
Tried with: Clementine 1.2 and Ubuntu 14.04