BF Debugger Project: An integrated GUI debugger for the development of software using the brainf*** programming language.
Brainf***: Introduction to programming in BF; interpreters written in Brainfuck, C, JavaScript; links.
Brainf*ck .Net Compiler: Brainfuck compiler that outputs .NET IL code. Includes source of sample programs.
Brainfuck Archive: Programs, compilers, interpreters, utilities, in source and compiled versions.
Brainfuck Interpreter in PHP: Downloads, short tutorial, some samples to get started.
BrainFuck Tools, Utilities and Games: Useful tools, utilities, games for and written in BF, articles on related topics. BF CGI Scripts, language conversion tools, programming utilities, first (possibly) text adventure written in BF. [JonRipley.com]
BrainScript: ActiveScript BF implementation.
Chaos Computer Club Cologne: Brainfuck: Descriptions (language, theory), code samples, original software (compilers, assembler, interpreter), mail list, links. Working to implement BF in hardware. English, Deutsch.
Esoteric Non-existent Standards Institute: The one, true, non-existent standard body for BF. Contains some efforts to provide formal language specifications for BF, and other resources.
GBrainfuck: A small, efficient, GPL'ed Brainfuck language interpreter written in C and intended to run on *NIX machines. [Open source, GPL]
mod_bf: Apache webserver Brainfuck module; several BF code handlers. Easily make dynamic webpages in BF. Simple example of uses of Apache API, simpler than standard Apache mod_example. Descriptions, downloads, links. [Open Source, GPL]
Mr. Rock's Brainfuck Pages: Language introduction, tutorial, resources, BF to Perl converter.
Some Brainfuck Fluff: 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.
The Brainfuck Programming Language: Brief overview, introduction to commands, informal standards for programmers and implementers, and related resources.