KeePassXC - KeePass Cross-Platform Community Edition - A community maintained fork of the popular KeePassX...
Knox - Knox offers easy disk image encryption and comes with a built-in backup service.
Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
Advanced File Security Basic - Download Advanced File Security Basic. Protect files by encrypting them with a strong password, a series of questions, or even an USB key you can carry around with this powerful security solution
Seahorse - Front end for GnuPG.
R-Crypto - R-Crypto is smart data security and disk encryption software that allows you to secure your sensitive information via strong encryption.