Mooz's Befunge Programs: A number of programs written in and related to Befunge. Includes an interpreter for the TI-86 calculator and an example of how to do floating point division in Befunge.
Tim's Befunge Compiler: This "pseudo-compiler" will create an ANSI C program from a Befunge-93 source file. Programs can still be self-modifying even after they are compiled.
VSync's Funge Stuff: Features a portable Befunge-93 pseudocompiler and several other compilers and interpreters. Demonstrates how to use Befunge as a CGI scripting language.