bitwarden - Bitwarden is a free and open source password management solution for individuals, teams, and business organizations.
GnuPG - GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).
Icecream Password Manager - Password Manager by Icecream Apps lets you protect and manage passwords, secure notes, credit cards, passports and other sensitive data. Windows version. Free Download.
Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
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.
PGP Tool - PGPTool allows you to encrypt and decrypt files. It's free and easy to use.