['Malbolge. It was created by Ben Olmstead in 1998, and considered to be one of the hardest programming language. ... ', 'Brainfuck. It was created in 1993 by Urban Müller. ... ', 'COW. It was created by Sean Heber in 2003. ... ', 'INTERCAL. It was created by Don Woods and James M. ... ', 'Whitespace. ... ', 'Chef.']