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Websites (paid and free) which teach programming

… kernel programming

… low-level security techniques

… cryptography

Capture-the-flag competitions

Frameworks, code, and other such things

CTFd
A CTF framework
iCTF
A CTF framework
SecGen
Create vulnerable virtual machines
Scratch
The Scratch programming environment; great for children
Email: www@flyn.org — ✉ 6110 Campfire Court; Columbia, Maryland 21045; USA