On of my favorites in this kind of contests (what they funnily enough have an entry for) is HQ9+.

Since it doesn't seem to have a regular English wiki article: It is an esotieric language that is not turing complete but can do pretty much anything that people usually do with esoteric languages. It has 4 opcodes:

H prints "Hello World!".

Q prints the source text of the input program (quine).

9 prints 99 bottles of beer.

+ increments the accumulator.