VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
BoxCryptor - Boxcryptor encrypts your sensitive files before uploading them to cloud storage services like Dropbox, Google Drive, Microsoft OneDrive, Box, and many others.
Axcrypt - AxCrypt - Password Protect Files With Strong Encryption. AxCrypt is the leading open source file encryption software for Windows.
Mega - Secure File Storage and collaboration
SSuite Mercury Rising - SSuite Mercury Rising data security software is the best free online AES encryption-based app that runs directly inside your web browser using pure HTML5 and javascript code.
Google Drive - Access and sync your files anywhere