Similar to Ripple_(支払いシステム)

Pretty Good Privacy

Proton VPN

ProVerif

PuTTY

Qubes OS

Riseup

S/MIME

Secure Shell

Security Support Provider Interface

Signal (software)

Signal Protocol

Silent Circle (software)

SSLeay

StrongSwan

Stunnel

Syskey

Guardian Project (software)

Comparison of TLS implementations

Tox (protocol)

Tuta (email)

VeraCrypt

Virtual private network

Whonix

WinSCP

Wire (software)

WireGuard

WolfSSL