The OpenSSL Project is a collaborative effort to develop a robust,
commercial-grade, full-featured, and Open Source toolkit implementing
the Secure Sockets Layer (SSL v3) and Transport Layer Security (TLS v1,
v1.1, v1.2, v1.3) protocols with full-strength cryptography world-wide.
The project is managed by a worldwide community of volunteers that use
the Internet to communicate, plan, and develop the OpenSSL tookit
and its related documentation.

OpenSSL is based on the excellent SSLeay library developed by Eric
A. Young and Tim J. Hudson. The OpenSSL toolkit is licensed under
an Apache-style licence, which basically means that you are free
to get and use it for commercial and non-commercial purposes subject
to some simple license conditions.

WWW: https://www.openssl.org/