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Might as well publish a first release.
As per the README, this project takes a deck of 54 unique playing cards (standard 52-card poker deck with 2 distinct jokers) and extracts the entropy out of the order in the deck of cards. This is done using a Lehmer code, which assigns a unique ID for every shuffle from 0 to 0x217277f77e01580cd32788186c96066a0711c72a98d891fbffffffffffff. As such, there are no collisions. Provided the deck is sufficiently shuffled, the resulting Lehmer code is as good as a true 237-bit random number.
Unfortunately, this tool requires drag-and-drop with the mouse. Eventually, I would love to make it more efficient with point-and-click, and perhaps even support the keyboard, but that'll be for another day.