lynis
Security auditing tool for Linux, macOS, and UNIX-based system
...The project is open source software with the GPL license and available since 2007. Since Lynis is flexible, it is used for several different purposes. Typical use cases for Lynis include security auditing, compliance testing (e.g. PCI, HIPAA, SOx), penetration testing, vulnerability detection, and system hardening. Test that Docker image, or improve the hardening of your deployed web application. Run daily health scans to discover new weaknesses. Show colleagues or clients what can be done to improve security. Discover security weaknesses on systems of your clients, that may eventually result in system compromise. ...