In Omniscope 2.8 we have added support for DropBox and GoogleDrive.
In the Omniscope file menu you can open (and subsequently save) a DropBox/GoogleDrive file directly by selecting "File > Open online file".
In DataManager, DropBox and GoogleDrive is supported in both the "Data file" source block and the "Data file" publisher block. You can also add a dropbox folder to your DataManager bookmarks by clicking the "Add" button in the bookmarks toolbar and selecting "Folder of files".