mboelen, Today Lynis 3.1.0 has been released. Never used it before? It's a lightweight tool packed with tests to scan your Linux/Unix systems for #security and #configuration issues. It helps with auditing and system hardening your system or environment.
Cost: free
License: GPLv3
Contributors: many
Website: https://cisofy.com/downloads/lynis/
Project URL: https://github.com/CISOfy/lynis