A number of alternative cryptocurrencies, or "Altcoins", have been created after taking inspiration from bitcoin's code. Many of these ‘altcoins’ differ significantly from Bitcoin and are interesting in their own right.

CoinMarketCap.com has a listing of the most popular altcoins including a bunch of helpful information about the altcoin, including market cap, price, available supply, and links to learn more about the specific altcoin.

The most popular altcoins are Litecoin and Dogeparty which hold the #2 and #3 positions as the most used cryptocurrencies.