Brief overview, introduction to commands, informal standards for programmers and implementers, and related resources. http://www.muppetlabs.com/~breadbox/bf/
The "father" of Brainfuck. Although this doesn't list anything for the language, it can give you an idea of who would come up with this language. http://ftp.wustl.edu/~umueller/
By Daniel B. Cristofani. Complete brainfuck reference; sources for various programs, including a Universal Turing Machine; brainfuck to SPARC compiler, and interpreters in C and JavaScript; suggestions, contest results. http://www.hevanet.com/cristofd/brainfuck/
The one, true, non-existent standard body for BF. Contains some efforts to provide formal language specifications for BF, and other resources. http://esoteric.sange.fi/ENSI/