gpg

GNU Privacy Guard (GnuPG or GPG) is a free-software replacement for Symantec's PGP cryptographic software suite.

A secure solution for file and email encryption.

A modern, cross-platform, open-source GUI for OpenPGP encryption.

Git identity manager - never commit with the wrong identity again

gopass is a simple but powerful password manager for your terminal

A dead simple tool to sign files and verify digital signatures.