It's a Brainfuck interpreter in lua that keeps track of the output and buffers it. As soon as you write a null character to the output it takes that buffer and executes it using loadstring and thus executes the previous output as lua code. If your output starts with an exclamation point(!) it will read whatever was returned by loadstring into Brainfuck's input.

The input will be modified according to the following rules:
Numbers will stay as they are and will cause errors if they aren't integer numbers within the range 0-255.
Booleans will be turned into 1(true) and 0(false).
Strings will be turned into char codes (as per usual).
All other types will be turned into strings and then handled like a string.

The Brainfuck programs do one operation every tick (using an always hook).

How do you use it? It comes with a few simple commands.

_BF.add_program(program,input,callback)

     Adds a program to be executed to the system.
     program: the Brainfuck code as a string
     input: the starting setup for the input as a string
     callback: function that will be triggered whenever the program puts out a character (can be nil)

_BF.dofile(file,input,callback)

     Adds a program to be executed to the system with empty input and no callback.
     file: the location of the Brainfuck code file
     input: the starting setup for the input as a string (can be nil)
     callback: function that will be triggered whenever the program puts out a character (can be nil)

It's a TISfuck interpreter in lua that operates in the same way the Brainfuck interface does. TISfuck is a language I created by myself on the basis of my Brainfuck interpreter.

How do you use it? It comes with a few simple commands.

_TF.add_program(program,input,callback)

     Adds a program to be executed to the system.
     program: the TISfuck code as a table of strings(lines)
     input: the starting setup for the input as a string
     callback: function that will be triggered whenever the program puts out a character (can be nil)

_TF.dofile(file,input,callback)

     Adds a program to be executed to the system with empty input and no callback.
     file: the location of the TISfuck code file
     input: the starting setup for the input as a string (can be nil)
     callback: function that will be triggered whenever the program puts out a character (can be nil)

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Update 2:
TISfuck interface
_BF.dofile caused nil call
sample programs are now provided as .bf files
Update 1:
bug causing a nil call if a callback was defined
input and callback parameter to _BF.dofile