Similar to OpenSSL

Kontact

Linux Unified Key Setup

Security Support Provider Interface

SSLeay

Guardian Project (software)

Comparison of TLS implementations

Whonix

WinSCP

Wire (software)

WireGuard

WolfSSL

Shadowsocks

Stunnel

Tera Term

Virtual private network

Proton Mail

Domain Name System Security Extensions

IPsec

ALTQ

DNS over TLS

Firewalld

Forward secrecy

HTTP Strict Transport Security

Ipfirewall