"CloudMounter is a must-have tool for laptop users with low-capacity SSD-drives. You can easily mount most popular clouds as disks without having to download online files on the hard drive. As well as secure cloud files with data encryption. Choose one of your Dropbox, Google Drive and OneDrive accounts and manage them in Finder for free."
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BoxCryptor is a cryptographic virtual harddisk that encrypts all data on-the-fly using the AES-256 standard. Encrypted data is stored in an arbitrary directory of your choice, e.g. one that is synced to the cloud like your Dropbox folder.
Tahoe-LAFS is a Free and Open cloud storage system. It distributes your data across multiple servers. Even if some of the servers fail or are taken over by an attacker, the entire filesystem continues to function correctly, preserving your privacy and security.
ownCloud gives you universal access to your files through a web interface or WebDAV. It also provides a platform to easily view & sync your contacts, calendars and bookmarks across all your devices and enables basic editing right on the web.