JPNBF, short for Jamie Phelan's Numerical Brainfuck Interpreter, is best described as an extension on Urban Müller's Brainfuck Language. Wikipedia describes this language as: "An esoteric programming language noted for its extreme minimalism. It was designed to challenge and amuse programmers. Its name has been variously bowdlerized, as in brainf*ck, brainf***, b****fuck or brainfsck."
JPNBF differs from Brainfuck in two different ways - most importantly, it adds more advanced mathematical constructs such as addition, subtraction, multiplication, division and exponentation of cells. The second difference is that JPNBF focuses only on numbers - it does not support ASCII natively.
You can get the latest and historical archived versions of JPNBF with both Win32 binaries and platform-independent FreeBasic sourcecode from our sourceforge download page.