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- CTF101
- OverTheWire - Bandit
- Hack The Box
- Microcorruption
- OWASP Juice Shop
- picoCTF
- SANS Holiday Hack Challenge 2022
- TryHackMe
- Google CTF Beginner Quest - cool art!
- CyberChef - Swiss Army Knife of useful Cyber and CTF tools
- dCore - 800 tools to help solve games, puzzles, coded messages, math, etc
- Google 😉
- Wireshark - Network Packet Analysis
- Zeek - Network Analysis/Threat Hunting
- Ghidra - Reverse Engineering
- OnlineGBD - Debugging
- How to Debug Using GDB - How to use OnlineGBD
- VirusTotal - To check file's hash and reputation
- Audacity - For audio steganography challenges