Armory is a free Bitcoin cold wallet supporting multi-signature. It is an open-source protocol utilizing high-end protection features. Historically Armory is one of the earliest efficient cold storage cryptocurrency wallets. This wallet has a reputation of one of the most secure Bitcoin wallets. Armory doesn't support any cryptocurrency besides Bitcoin (BTC).
Armory allows users to create multiple addresses that can be used for separate transactions or to avoid using the same address for the coins needed for separate purposes. Private keys can be optionally kept offline.
Once a user shares her/his Bitcoin address with others she/he is ready to receive payments. There's a “Receive Bitcoin” button in the Armory interface. After tapping this button user should choose a proper wallet to receive the payment. The address can be copied and pasted or turned into a QR code that can be sent as a text. "Send Bitcoin" option has a bar for pasting of the receiver's Bitcoin address. A user simply fills this bar and sends a certain amount of coins. All transactions are sent and received directly.
Armory has no 2-step authentication feature and doesn't work on mobile devices.