Alert to win – https://alf.nu/alert1
Attack-Defense – https://attackdefense.com
Bancocn – https://bancocn.com
Certified Secure – https://lnkd.in/gBKK-i-s
CMD Challenge – https://cmdchallenge.com
CryptoHack – https://cryptohack.org/
CTF Komodo Security – https://ctf.komodosec.com
Ctftime – https://ctftime.org/
Cyberdefenders – https://lnkd.in/gCf8v4Ju
CyberSecLabs – https://lnkd.in/gmyzMXju
EchoCTF – https://echoctf.red/
Explotation Education – https://exploit.education
Google CTF – https://lnkd.in/e46drbz8
Hack The Box – https://lnkd.in/ggfAMdQ8
Hackaflag BR – https://hackaflag.com.br/
Hacker Security – https://lnkd.in/gJbSaY3f
Hacker101 – https://ctf.hacker101.com
Hacking-Lab – https://hacking-lab.com/
Hacksplaining – https://lnkd.in/gVd9dNkK
HackTheBox – https://www.hackthebox.com
Hackthis – https://www.hackthis.co.uk
HackXpert – https://hackxpert.com/
HSTRIKE – https://hstrike.com
ImmersiveLabs – https://immersivelabs.com
LetsDefend- https://letsdefend.io/
NewbieContest – https://lnkd.in/gZ4UjDhy
OSBOXES – http://www.osboxes.org/
OverTheWire – http://overthewire.org
Penetration Testing Practice Labs – https://lnkd.in/grQev9Kk
PentestIT LAB – https://lab.pentestit.ru
Pentestlab – https://pentesterlab.com
PicoCTF – https://picoctf.com
PortSwigger Web Security Academy – https://lnkd.in/gAPq2ezr
Practical Pentest Labs – https://lnkd.in/gUSqv6xS
Pwn college – https://dojo.pwn.college/
PWNABLE – https://lnkd.in/gNcyqG64
RangeForce – https://lnkd.in/gGy3feqt
Root in Jail – http://rootinjail.com
Root-Me – https://www.root-me.org
SANS Challenger – https://lnkd.in/gG-5_ZPF
SmashTheStack – https://lnkd.in/gMFNTURc
TCM Security – https://lnkd.in/gbQinqvf
The Cryptopals Crypto Challenges – https://cryptopals.com
Try Hack Me – https://tryhackme.com
Vulnhub – https://www.vulnhub.com
Vulnmachines https://vulnmachines.com/
W3Challs – https://w3challs.com
WeChall – http://www.wechall.net
Zenk-Security – https://lnkd.in/g_y_p5ha
Webgoat – https://lnkd.in/gjsgegYw
Dojo – https://dojo-yeswehack.com/
Cyber Security Education Platform
Securzy – https://securzy.io/