bfu is an interactive command-line brainfuck debugger with support for breakpoints and watchpoints, undoing and redoing instructions, and more. It may also operate in interpreter and preprocessor modes.
I wrote it as a joke in my student years, and to be honest I have no idea what the hell is going on in the source code. Though it seems I added some documentation.
Run bfu -h for command-line options.
Run bfu -m or pod2man bfu | man -l - to view the man page, or see MANUAL.md.