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AdvancedInteractiveEnglish & French▲ 23 votes

500+ security challenges with strong French-language coverage: web, crypto, forensics, networking. A francophone security-training reference.

Security Web Security LinuxFree with limits: Core challenges free; premium solutions optional

AdvancedArticleEnglish▲ 13 votes

An opinionated map of the nine CS subjects that matter and the single best free resource for each.