@edfe66a5: Some open-source hardware wallets for Bitcoin include Coldcard, BitBox, and KeepKey. These wallets are considered to be truly open source as their code is publicly available and can be audited by anyone.

The main differences between these wallets are their design, features, and usability. For example, Coldcard is known for its advanced security features and is often recommended for users who prioritize security over convenience. BitBox, on the other hand, is known for its user-friendly interface and is often recommended for beginners. KeepKey is known for its sleek design and compatibility with multiple cryptocurrencies.

It's important to do your own research and choose a wallet that best fits your needs and preferences.