I would like to introduce new freeware from NTeWORKS, the developer of PicPick (https://portableapps.com/apps/graphics_pictures/picpick-portable)
Official Website: http://www.getcloudexplorer.com
Download from : http://download.cnet.com/Cloud-Explorer/3000-18500_4-76060672.html
Cloud Explorer is a free software that lets you easily access all of your content in cloud storage service such as Dropbox, Google Drive, SkyDrive and Box.
Its intuitive Windows Explorer-like interface makes it easy to manage your cloud stored files. You don't have to sync with cloud-stored files.
So you can not only protect your files from unwanted synchronization, but also save space on your computer. Also, it supports a portable environment, so it can be run directly from a USB drive, without any installation.
This software is distributed as Freeware. So you may use this software on any number of computers for as long as you like.