Top 10 Security Tools according to ToolsWatch.Org Readers

Not all are free

01 – OWASP ZAP – Zed Attack Proxy Project
02 – Lynis
03 – Haka
04 – Faraday
05 – BeEF – The Browser Exploitation Framework
06 – Burp Suite
07 – PeStudio
08 – Nmap
09 – IDA Pro
10 – OWASP Offensive (Web) Testing Framework


Check here:
http://www.toolswatch.org/2016/02/2015-top-security-tools-as-voted-by-toolswatch-org-readers/