I use CorelDraw, which is not a cheap program. But then again, there are plenty of comparable inexpensive substitutes. Microsoft Publisher comes to mind. And you can probably find less expensive stuff, still. For example, if you have a Macintosh, AppleWorks is free.
None of these programs are written specifically for making footprint charts; They're general artwork & layout programs. But they do the trick nicely. If you like the way mine look, you're welcome to copy the design.
Regards,
Jonathan Atkinson
www.ballroomdancers.com