OpenSSL adds TLS 1.3 (Transport Layer Security) supports in the alpha version of OpenSSL 1.1.1. The first Internet-Draft dates back to April 2014, in January it was presented the 23 and will expire on July 9, 2018. The new OpenSSL release also includes the implementation for SHA3 and multi-prime RSA, and the support for the SipHash set of pseudorandom functions. The alpha release is available for download via HTTP and FTP from the following master locations (you can find the various FTP mirrors under https://www.openssl.org/source/mirror)”]
Source: http://securityaffairs.co/wordpress/69145/hacking/openssl-tls-1-3.html