Similar to Stunnel

LibreSSL

Network Security Services

OpenSSH

OpenSSL

Openswan

Ophcrack

Security Support Provider Interface

SSLeay

StrongSwan

Comparison of TLS implementations

WireGuard

WolfSSL

TrueCrypt

Alien (file converter)

ANTLR

AoTuV

Apache Axis

Apache OpenNLP

OpenOffice Writer

Apache POI

APBS (software)

GNU Autotools

Avahi (software)