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.
KeePass - KeePass is an open source password manager. Passwords can be stored in highly-encrypted databases, which can be unlocked with one master password or key file.
Exocet - Exocet creates a Folder on your System.
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.