If your alt coins based on the ETH blockchain you can use myetherwallet.com if you have waves platform of course use waves wallet that you can download on apps store or google play if you also using a mobile. And If you wanted the other different wallet and you don't want a myetherwallet.com as a altcoin wallet, You also us Metamask wallet. That is the best and safest wallet for me on ERC20 alt coins.