GnuPGThe GNU Privacy Guard, the free implementation of the OpenPGP standard that encrypts and signs email, files and, crucially, the software packages of nearly every Linux distribution. Werner Koch has maintained this foundation of digital trust since 1997.KeePassXCOffline password manager keeping credentials in a strongly encrypted local database file, with browser integration, TOTP and hardware-key support. A community fork of KeePassX, it embodies the principle that secrets belong on your own disk, not in someone's cloud.OpenSSHThe OpenBSD project's free implementation of the SSH protocol — the tool through which virtually every server on the internet is administered. Developed with OpenBSD's trademark security discipline and audited relentlessly for over 25 years.
