AES

Implementations

In Python:

• Brandon Stern's AES implementation in Python

Including step-by-step test vector (for AES-256) — MAYBE INCORRECT

• Caller9's python implementation on GitHub
• Richard Moore's implementation on GitHub

In Go:

• Krishna's blog -- Implementing AES

Clear explanation and implemetation

In Javascript:

• AES (Rijndael) Encryption Test in JavaScript, from Herbert Hanewinkel (input in hexadecimal, as it ought to be!)