TrueCrypt is an open source software to encrypt volumes of data. It even supports the creation of virtual encrypted volumes which is portable. Developed by TrueCrypt Foundation
License: Open Source
TrueCrypt is an open-source encryption tool known for its strong security features, including full disk encryption and hidden volumes, making it suitable for advanced users. In contrast, Steganos Privacy Suite offers a broader range of privacy tools, including a password manager and backup features, but lacks the open-source transparency of TrueCrypt.