VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
SensiGuard - Use SensiGuard file encryption software to lock and encrypt files and folders on your Windows XP, Windows Vista or Windows 7 PC or any USB flash drive
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.
AES Crypt - AES Crypt is an advanced file encryption utility that integrates with the Windows shell or runs from the Linux command prompt to provide a simple, yet powerful, tool for encrypting files using the Advanced Encryption Standard (AES).
Axcrypt - AxCrypt - Password Protect Files With Strong Encryption. AxCrypt is the leading open source file encryption software for Windows.
Folder Lock - Folder Lock is a security software that helps you to password protect files, shred files, clean history, encrypt the personal documents and much more.