OpenSSL is an open source implementation of the SSL and TLS protocols. Questions about how to use the OpenSSL tools and libraries are usually better asked at Stack Overflow or Super User.
OpenSSL is an open source implementation of the SSL and TLS protocols. The OpenSSL ssl library — which implements the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols — can be found at https://www.openssl.org/.
Note that questions about using the OpenSSL toolkit and libraries are generally off-topic on Crypto.SE, and should be asked at Stack Overflow (for the libraries) or Super User (for the command-line tools) instead. Questions about professional server administration tasks involving OpenSSL (such a certificate management) may also be on-topic at Server Fault.