Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
KeePassXC - KeePass Cross-Platform Community Edition - A community maintained fork of the popular KeePassX...
GnuPG - GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).
GPG Suite - Use GPG Suite to encrypt, decrypt, sign and verify files or messages.
Seahorse - Front end for GnuPG.
GPG4Win - GPG4Win is an encryption program for files and emails. The program encrypts emails and files so that they can only be read by those intended to receive them.