Minimal-2D

Minimal-2D is the name of a 2D programming language made by User:Alegend, on August 10, 2009. It only has 11 commands:

The program, when it starts, automatically starts processing in the rightward direction.

Hello World
>++ R<+++D R >++++++>+++++++++>++++++++++D D++>R/ +++>++++>L +  UU/->+LD    .++++++++++>..L R+++.>++.>--..+++.>.>-.>--..+++.--U

Computational class
Minimal-2D is obviously Turing-complete through reduction from Brainfuck, as a Brainfuck loop abcd[efgh]ijkl can be translated as: abcd/D   /LRijkl Refgh/UU

External resources

 * An interpreter can be found here.
 * An interpreter written in c++ with additional (but optional) language features can be found here.