CloudFogger is an application available for Windows, Mac, Andoird, iOS. There are many more similar tools and services that are available i.e. SpiderOak, Mozy, Carbonite, IDrive or BoxCryptor and many more.
However, CloudFogger is not an open source software, so there is an alternate available called "CryptSync", which is an open source tool for encrypting the files before uploading to cloud server and it also does not store your files on the developer's server like CloudFogger.
Also, read my previous article on, "How to Encrypt Your Emails against an invasion of privacy by NSA".