CloundMounter is a Mac app that lives in your Menu Bar. It allows you to access various cloud services without having to install the local apps (Dropbox, Google Drive, OneDrive, etc). You can also use it to connect to Amazon S3 as well as any FTP/WebDAV server.
This is an extremely handy app when you need to access a large Dropbox account, but you don’t have a lot of local storage available on your Mac.
Download it on the App Store for $29.99.