They're didn't really write a web app framework in brainfuck, they just plugged a PHP interpreter of brainfuck into a module for apache.
I mean, yeah, you can make web pages, but that hardly justifies the nomenclature "framework".
Yeah, but why not aim higher? Er, lower?
Besides, unlike brainfuck, Unlambda is actually a plausible language for writing nontrivial code--painful, but not inconceivable.
Almost.