CTF

PEW PEW http://ocularwarfare.com/ipew/index.html?bad_day=1&nofx=1

Notes for running CTF events: https://raw.githubusercontent.com/pwning/docs/master/suggestions-for-running-a-ctf.markdown

Middle and high school students CTF: http://camsctf.com/

Pentesterlab exercises: https://pentesterlab.com/exercises/

Guyerre web app game: http://google-gruyere.appspot.com/

Hackademic from owasp: https://www.owasp.org/index.php/OWASP_Hackademic_Challenges_Project