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 solution focused on local encryption, offering strong security but lacking in user-friendliness and cloud integration. In contrast, Boxcryptor excels in ease of use, cloud integration, and cross-platform support, making it ideal for users who need secure access to their files across various devices.