Practice cybersecurity skills, penetration testing, and CTF challenges.
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- CryptoHack Free
- Interactive cryptography challenges from basics to advanced ciphers.
- CTFlearn Free
- Community-driven CTF platform with challenges across multiple categories.
- CTFtime Free
- Calendar and archive of CTF competitions worldwide.
- ImaginaryCTF Free
- Regular CTF competitions with beginner-friendly challenges and writeups.
- IO Free
- Security challenges and wargames.
- Microcorruption Free
- Embedded security challenges.
- OverTheWire - Challenges Free
- Security wargames for learning.
- PentesterLab Free
- Web application security exercises.
- picoCTF Free
- Free beginner-friendly cybersecurity competition.
- PicoCTF Free
- Beginner-friendly CTF competition designed for high school students.
- Root Me Free
- Free CTF platform with web, network, and system challenges.
- Root Me Free
- French-origin hacking challenges platform with real-world scenarios.
- SmashTheStack Free
- Wargaming network and system challenges.
- VulnHub Free
- Vulnerable machines for penetration testing practice.
- CTF365 Freemium
- Year-round CTF training platform.
- CyberSecLabs Freemium
- Hands-on penetration testing labs.
- Hack The Box Freemium
- Realistic penetration testing labs and CTF challenges.
- TryHackMe Freemium
- Guided cybersecurity labs from beginner to advanced.