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Apart from bitcoins and altcoins, are there any other virtual currencies (like game currencies, gift cards or coupons) that include cryptography in their algorithm?

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Is suppose you choose to not consider online payment, credit card payment with euros, pounds, yens, etc(which include cryptography in their algorithms)...

In the 90's, there was a company called Digi-cash funded by David Chaum: https://en.wikipedia.org/wiki/DigiCash The goal was to provide anonymous transactions to users and was based on his previous academic work about e-cash The company doesn't exist any more, but it's the best example of "cryptocurrency" not based on the "blockchain protocol".

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