The open-source step-ca project provides the infrastructure, automations, and workflows to securely operate a private certificate authority.

GitHub: https://github.com/smallstep/certificates

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

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