Hannah

Hannah is a two-dimensional esoteric programming language invented by Marz. It is believed to be Turing complete.

A description of Hannah can be found here, and some examples can be found here.

Hello, world!
This program outputs the ASCII for "Hello, world!" in binary. hello world v v    vv  v v vv vv   vv vv   vv vvvv  v vv    v      vvv vvv  v    v oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo

Cat
This program outputs input bytes until it reaches a null. cat v xv< < < <  < <  < ///////////////// v v v  v v  v v  v i  i i  i i  i i  i /oo/ /oo/ /oo/ /oo/