Altcoin

Sure, like all the other altcoins, Dogecoin offers some variability, like a theoretical max of 100 billion versus 21 million, and a different proof-of-work algorithm, but we’re reaching Furby levels of ridiculousness here.

Altcoins use either Scrypt or SHA256 encryption algorithm, because the 'project forks' are from either Litecoin or Bitcoin. […] A few crypto economists believed that Altcoins is contributed ^([sic]) to a diverse crypto commodities marketplace, which is good.

Indeed, after a week of existence, Dogecoin is already the 24th most valuable altcoin, with a total market value of $1,621,559 based on the exchange CoinedUp, though it might be worth even more elsewhere.

MASTERCOIN […] An altcoin invented by J. R. Willett. According to the Website, “The Master Protocol facilitates the creation and trading of smart properties and user currencies as well as other types of smart contracts. […]”

Most altcoins follow the bitcoin model of having a finite ultimate supply of coins.