Security Headers   https://securityheaders.com   Nice quick tool that will peek and poke about your website and then tell you issues and security weakness that may surprise you! Give it a try.

 

Redflare  http://openflare.org    "…Redflare really is just for Windows administrators with little knowledge in Linux…."   Site also has some Vulnerability alerts, etc

NIR SOFT  http://www.nirsoft.net  unique collection of small and useful freeware utilities. Password recovery, sniffers, networking tools, etc.