ctf

Multi-user CTF/tournament platform with levels, scoring, and native grading for user isolation and competition.

Curated list of 100+ free, legal environments for practicing offensive security: deliberately-vulnerable apps (DVWA, Juice Shop, WebGoat, Mutillidae), CTF platforms (HackTheBox, TryHackMe, picoCTF, Root-Me), wargames (OverTheWire, pwnable.kr), and specialized labs for crypto, RE, and binary exploitation.