bitcoin-signing
There are 2 repositories under bitcoin-signing topic.
CryptoDappRun/Bitcoin-Signer-Wallet
Bitcoin Signer Wallet is a free bitcoin/litecoin/dogecoin cold wallet,open source,you can sign your transaction offline on your Windows,MAC OS,iPhone,iPad,IOS,Android,Linux and any support HTML OS.transfer your crypto coin with safest way.
ArcticTechnology/SimpleWallet
Simple Wallet is a minimalist Bitcoin wallet that lets you securely create Bitcoin addresses, sign messages, and validate addresses.