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

Memory

http://www.honeynet.org/challenges/2011_7_compromised_server

Toolz

CTF tools with installer: https://github.com/zardus/ctf-tools

CTF tools (list only): https://github.com/apsdehal/awesome-ctf

Batteries-Included CTF Vagrant Box: https://github.com/ctfhacker/EpicTreasure

Pwntools: https://github.com/Gallopsled/pwntools

Binjitsu (fork of pwntools): https://github.com/binjitsu/binjitsu/