If you're willing to be a little creative with your interpretation of the requirements, here are a few options that haven't been mentioned: Intercal, one of th

If you're willing to be a little creative with your interpretation of the requirements, here are a few options that haven't been mentioned: Intercal, one of the first joke programming languages. MS Excel macros, probably the most widely used programming languages today. VHDL or Verilog, the hardware description languages One of the one-instruction-set computers, like http://en.wikipedia.org/wiki/One_instruction_set_computer#Reverse_subtract_and_skip_if_borrow http://en.wikipedia.org/wiki/One_instruction_set_computer#Re... TeX or PostScript, both of which are technically Turing complete, but not usually considered to be programming languages