Hello.
We have almost completed development of the project for the unification of the clouds in the same application.
Yes, you say, that such apps already exist, but you will be wrong :)
Unlike all competitors, we do collect everything in one place. All photos from all clouds are in the category of photos, music in music category, etc.
You say that this is cloudGOO, but cloudGOO gives only 3  clouds in the free version, and we give 7. cloudGoo allows you to get up to 42 GB, and we allow you to get minimum 100 GB. We allow you to create additional categories, our app is translated into 25 languages, allows you to find and remove any duplicates, we give detail statistics about everything concerning clouds and files in them and provide easy search of all the files in the clouds, auto uploading all types of files and work without an Internet connection. We allow you to manage settings of all  categories, and all the clouds, to decide which category to link with clouds, and much more. 
We made really easy to use and beautiful app that collects all in one place and gives 100 GB of cloud space for free :).
This is mobile solution, so please do not compare us with otixo, which deals only with file transfer, with Jolicloud, which does not collect everything in one place, and you still have to switch  between clouds, as in odrive.
Although, half a year more and our decision will be released on PC and MAC, and believe me, there we will offer features that will surprise everyone :)
We do not have a sponsor, and there is no money involved. We all pull ourselves so could yet develop only android solution. You know that there are more than 5,000 kinds of Android devices and we can not physically test our app on all of them, we ask all concerned and curious to take part in beta testing. 
Please, send your gmail to bcloud@bnesis.com, so that we could send you an invitation next week for beta testing.
BCloud