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
Sookasa is a cloud encryption service focused on secure file sharing and compliance, making it suitable for businesses that need to protect sensitive data. TrueCrypt, on the other hand, is an open-source disk encryption software that is more suited for users looking for strong encryption without ongoing costs, though it lacks support and updates.