EC-Council Code of Ethics, https://www.eccouncil.org/code-of-ethics/

(ISC)^2 Code of Ethics, https://www.isc2.org/ethics/

Penetration Testing Execution Standard, https://www.pentest-standard.org/

Shodan, https://www.shodan.io/

SSL Labs, https://www.ssllabs.com/

NMap, https://nmap.org/

SQLMap, http://sqlmap.org/

OpenVAS, https://openvas.org/

Tenable Security Nessus, https://www.tenable.com/products/nessus/nessus-professional

Rapid7 Nexpose, https://www.rapid7.com/products/nexpose/

Kali, https://www.kali.org/

Kali Downloads, https://www.kali.org/downloads/

Metasploit, https://metasploit.com/ 

Metasploit Unleashed, https://offensive-security.com/metasploit-unleashed/ 

Metasploit Blog, https://blog.rapid7.com/tag/metasploit/

Kali Linux Blog, https://www.offensive-security.com/blog/

Kali Forums, https://forums.kali.org/ 

Pluralsight Learning Path: Ethical Hacking Fundamentals, https://app.pluralsight.com/paths/skill/ethical-hacking-fundamentals

Pluralsight Learning Path: CompTIA Pentest+ https://app.pluralsight.com/paths/certificate/comptia-pentest-pt0-001

Pluralsight Learning Path: Ethical Hacking (CEH), https://app.pluralsight.com/paths/certificate/ethical-hacking-ceh-prep-2018

Pluralsight Learning Path: Survey of Information Security, https://app.pluralsight.com/paths/skill/survey-of-information-security-skill
