SSH configuration scanners
ssh-audit (SSH auditing tool)
The ssh-audit tool helps to perform a security assessment of SSH servers and their configuration. It can be used for security testing and penetration tests.
ssh_scan (SSH configuration scanner)
The ssh_scan utility is a SSH configuration and policy scanner maintained by the Mozilla Foundation. It helps to secure Linux systems running the OpenSSH.
SSHsec (SSH configuration scanner)
SSHsec scans a system running the SSH protocol and retrieves its configuration, host keys, and Diffie-Hellman groups.