CryptoLyzer is a multiprotocol cryptographic settings analyzer with SSL/TLS, SSH, and HTTP header analysis ability.

...SSL test suite aiming to support all the ciphersuites defined in any RFC

Clevis is a pluggable framework for automated decryption. It can be used to provide automated decryption of data or even automated unlocking of LUKS volumes.

Let's Encrypt client and ACME library written in Go

CAA is a new mechanism that will allow site owners to specify which Certificate Authorities are authorised to issue certificates for their domain name.