Contributions are welcome. If you would like to study, extend or revise ASCII Jam's Java code, it is available here.
Some fonts used by ASCII Jam are not complete. The font file format is called Figlet. It's pretty easy to understand. Here are a couple figlet fonts that I think deserve to be finished. Someone with a little knowledge of calligraphy could do this. (The unfinished areas are marked with descriptions of the characters that still need to be represented.) contact the author.