It's not quite possible to have an all-in-one wallet yet. Remember that other coins have architectures that are either based on Eth or on BTC, and those two have separate wallets themselves, so it may happen, but not right now. One desktop wallet that I know is Exodus, which actually supports may cryptos in it, and act as a wallet to them too. But, it's limited to the famous coins, and some Eth assets, so it's not that flexible yet.