I'd be interested in folks listing the best Kindle WiFi Active Content and their available Amazon internet sites. Amazon does not group them all together and we could help each other here doing that.
Here are my two so far:
Chess (games can be saved with elapsed times for both sides and positions) -
http://www.amazon.com/gp/product/B00...=docs-os-doi_0
Calculator (full featured with ability to save memory) -
http://www.amazon.com/gp/product/B00...=docs-os-doi_0