The Leondrino Wallet is the official wallet for the Staramba ITO. You can earn bonus tokens by signing up for a Leondrino Wallet account even before the ITO begins.
Sign up to get whitelisted and you will see a link to the Leondrino Wallet on the success page.
It is not necessary to use the Leondrino wallet to purchase tokens during the ITO or to store and transfer them afterwards. Any ERC20 Compliant (EIP-20) Ethereum wallet can be used to store and transfer STT tokens.
MyEtherWallet and MetaMask are the recommended alternatives to the Leondrino Wallet.