Resources

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http://www.hackingtutorials.org/web-application-hacking/websploit-cloudflare-resolver-module/
https://www.cybrary.it/
http://ihackers.co/downloads/books/publishers/syngress/
https://ibotpeaches.github.io/Apktool/
https://packetstormsecurity.com/files/tags/python/
http://www.catb.org/esr/faqs/hacker-howto.html



Training Material

    Codecademy: http://www.codecademy.com/
    Corelan: https://www.corelan.be/index.php/articles/
    End Game (How to Get Started in CTF): http://www.endgame.com/
    Hacking Cisco: http://hackingcisco.blogspot.com/
    Metasploit Unleashed: http://www.offensive-security.com/metasploit-unleashed/
    Open Security Training: http://opensecuritytraining.info/
    Pentest Standard: http://www.pentest-standard.org/index.php/Main_Page
    Router Gods: http://www.routergods.com/
    SWEET (Secure WEb dEvelopment Teaching): http://www.csis.pace.edu/~lchen/sweet/
    SEED: Vulnerability and Attack Labs: http://www.cis.syr.edu/~wedu/seed/all_labs.html/
    Security Tube: http://www.securitytube.net/

Random services:
http://10minutemail.com
http://whatstheirip.com/

Live Online Games
Recommended

Whether they're being updated, contain high quality challenges, or just have a lot of depth, these are probably where you want to spend the most time.

    http://pwnable.kr/ (one of the more popular recent wargamming sets of challenges)
    https://picoctf.com/ (Designed for high school students while the event is usually new every year, it's left online and has a great difficulty progression)
    https://microcorruption.com/login (one of the best interfaces, a good difficulty curve and introduction to low-level reverse engineering, specifically on an MSP430)
    http://reversing.kr/
    http://hax.tor.hu/
    https://w3challs.com/
    https://pwn0.com/
    http://www.smashthestack.org/
    http://ringzer0team.com/
    http://www.hellboundhackers.org/
    http://www.overthewire.org/wargames/
    http://counterhack.net/Counter_Hack/Challenges.html
    http://www.hackthissite.org/
    http://vulnhub.com/

Others

    http://hackthecause.info/
    http://bright-shadows.net/
    http://www.mod-x.co.uk/main.php
    http://scanme.nmap.org/
    http://www.hackertest.net/
    http://net-force.nl/
    http://securityoverride.org/ Some good concepts, but "canned" vulnerabilities (string matching on input) will frustrate knowledgable hackers and teach newbies the wrong lessons

Meta

    http://www.wechall.net/sites.php (excellent list of challenge sites)
    http://ctf.forgottensec.com/wiki/ (good CTF wiki, though focused on CCDC)
    http://repo.shell-storm.org/CTF/ (great archive of CTFs)

Webapp Specific

    http://demo.testfire.net/
    http://wocares.com/xsstester.php
    http://crackme.cenzic.com/
    http://test.acunetix.com/
    http://zero.webappsecurity.com/

Forensics Specific

    http://computer-forensics.sans.org/community/challenges
    http://forensicscontest.com/

Recruiting

    https://www.praetorian.com/challenges/pwnable/
    http://rtncyberjobs.com/
    http://0x41414141.com/

Paid Training

    http://heorot.net/

Downloadable Offline Games

    http://www.badstore.net/
    http://www.owasp.org/index.php/Category:OWASP_WebGoat_Project
    http://www.owasp.org/index.php/Owasp_SiteGenerator
    Damn Vulnerable Web App
    Stanford SecureBench
    Stanford SecureBench Micro
    http://www.irongeek.com/i.php?page=security/mutillidae-deliberately-vulnerable-php-owasp-top-10

Virtual Machines

    https://pentesterlab.com/exercises/
    http://sourceforge.net/projects/metasploitable/files/Metasploitable2/
    Damn Vulnerable Linux (not currently live? local mirror)