http://mmgen55rtcahqfp2hn3v7syqv2wqanks5oeezqg3ykwfkebmouzjxlad.onion/project/mmgen/mmgen-wallet
The scripts
work in tandem with a reference Bitcoin or altcoin daemon running on both online
and offline computers to provide a robust solution for securely storing,
tracking, sending and receiving your crypto assets. The online computer is used for tracking balances and creating and sending
transactions, while the offline machine (typically an air-gapped, low-power
device such as a Raspberry Pi) takes care of wallet creation, address generation
and transaction signing.