I've heard of a few computer board game designers, such as Vassal, Cyberboard, and Zun Tzu. Which would work best for building a custom card game? Note, I am willing to use one I haven't heard of, so ...
I've been playing around with an idea for a card game for some time, and I think I've finally got the idea fairly well in place. How can I best start testing it out to refine it?