GNOME is a free and open-source desktop environment for Linux and other Unix-like operating systems.

Kleopatra is a certificate manager and GUI for GnuPG. The software stores OpenPGP certificates and keys.

Riseup is a volunteer-run collective providing secure email, email lists, a VPN service, online chat, and other online services.

Tails, or "The Amnesic Incognito Live System," is a security-focused Debian-based Linux distribution aimed at preserving Internet privacy and anonymity.