There are too many to count, and some have pretty good uses, but none of them (in my opinion) would topple down bitcoin and ethereum. The only cryptocurrencies that I can think of is Cardano, Polkadot, and of course BNB. We can see how much of these cryptocurrencies contribute to the market. Cardano with it's much better proof of stake than ETH. Polkadot with its relay chain that allows the interoperability of varying networks. Lastly, BNB which is a utility cryptocurrency that operates as a payment method for the fees associated with trading on the Binance Exchange. All of them are good cryptocurrencies that have the potential to rise in the future.