https://gchq.github.io/CyberChef/

https://github.com/JohnHammond/ctf-katana

https://github.com/apsdehal/awesome-ctf

https://github.com/Rajchowdhury420/CTF-CheatSheet

CTFs

Pwn & Reverse

Malware

Linux

Crypto

Forensics & Stego

Windows

Web