Air explorer lets you access all your cloud storage accounts from a single place. The FREE version lets you include only 1 account per cloud, does not support encryption or password to enter the program, and limits uploads and downloads to 5 simultaneous tasks.
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Pro Wide array of cloud storage services supported
Dropbox, Google Drive, OneDrive, Mega, Mediafire, WebDav, Yandex and many others are supported.
Pro Search function available
This should be a given, but many similar programs lack this function: Air Explorer lets you search all connected cloud storage accounts for a file.
The user interface is quite easy to use.