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
EncFS4Win is a user-friendly, open-source solution primarily for Windows and Linux that offers easy file encryption but lacks advanced features and active support. In contrast, TrueCrypt is a more robust encryption tool with a wider range of features and strong community support, but it is no longer maintained, which raises security concerns.