Hey ! Before reading this, if you don't know anything about Brainfuck, you should get a see at the wikipedia page.
For my first complete program, I wanted this 'cause it is not so hard to do, and it is a great challenge.
The program has to be stored in Str1, and a list called BF will be made during the execution of the program (but you can choose to automatically delete it at the end of the execution if you want).
You can choose the debug mode, with some things that are displayed at the top of the screen :

• The place where the cursor is
• What command the interpreter is executing
• The value of the cell that the cursor is pointing

And, you'll have to activate every step with Enter.
In normal mode, only things that the programs chooses to display will appear on the screen, and all steps will be activated automatically.

Done :

• >
• <
• +
• -
• [
• ]
• Self growing list

To do :

• ,
• .
• Options menu
• Debug menu
• Errors management

As soon as all the commands will be made, I'll put a download link, but if you want complete version, you're gonna have to download it at every versions.

EDIT : I've noticed I didn't say it, but it is in TI-Basic. :]