- https://www.hackthissite.org/
- https://www.hackthebox.eu/
- https://owasp.org/www-project-webgoat/
- http://www.itsecgames.com/index.htm
- https://hackthebox.com/challenges
- https://github.com/OWASP/owasp-mastg/tree/master/Crackmes
- https://github.com/xtiankisutsa/awesome-mobile-CTF