Vulnerability scanner for Linux/FreeBSD, agentless, written in golang.
https://github.com/future-architect/vuls
Lynis - Security auditing and hardening tool, for UNIX-based systems
https://github.com/CISOfy/lynis
ssh-audit is a tool for ssh server auditing.
https://github.com/arthepsy/ssh-audit
PentestBox is an Opensource PreConfigured Portable Penetration Testing Environment for the Windows Operating System