CloudMesh is an app that enables you to manage all your cloud accounts and your local ones. You can easily copy/delete/move files from one cloud to another, upload files or download them to your phone. The app has an integrated search that let you find out where is that one file across all your cloud accounts and sync system that lets you upload or download your files from or to your phone.
Right now the app supports Dropbox, Box, GoogleDrive, MeoCloud, Facebook, Phone files, SD Card, Onedrive, Mega, Copy.com, 4Shared and 4Sync.
As part of the MyAppFree program the Pro version of the app, normally $1.99, is available completely free.
The Pro version, which has no ads and allows multiple sync configurations, can be found in the Windows Phone Store here.