ArcGIS Explorer Desktop might be a bit more popular than card.io. We know about 1 link to it since March 2021 and only 1 link to card.io. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
First thing I tried was typed card.io in my web-browser to see whether it would bring me to a website associated with this game. Source: almost 2 years ago
You need ArcGIS Desktop to open MXDs but if they can export a PMF you can use ArcGIS Explorer. Source: about 2 years ago
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