Here is a few links I collect and found useful enough, you may think they are useful for you as well.

Programming Languages: Scheme, J, Lambda Calculus, Concurrency and Language Design, Java Concurrency

Cryptography: Multiplicative Inverses, SubBytes Transform circuit for AES Cipher, Notes on cryptography

Computer Vision: Connected component labeling

Maths: Primes, Wolfram Mathworld, GGraph Theory