SSL https://en.wikipedia.org/wiki/Comparison_of_TLS_implementations BoringSSL OpenSSL WolfSSL LibreSSL mbedTLS ( ex. PolarSSL ) GnuTLS https://www.gnutls.org/download.html 3.4 / 3.5 / 3.6 -> gnutls_3_4 -> gnutls_3_5 -> gnutls_3_6 git@gitlab.com:gnutls/gnutls.git Opera Firefox Chrome