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
Apps available for
Mac OS X
Windows
Linux
Discontinued
Jetico BestCrypt VS TrueCrypt
TrueCrypt is an open-source software that is no longer maintained, which may pose security risks, while Jetico BestCrypt is a commercial solution with regular updates and strong encryption features, making it a more secure option for users.