Which feature/software would you appreciate in an airgapped OS?

Hi !

I'm currently working on AirgapOS, a FOSS live Linux distribution made to prevent any kind of network connection in order to maximize its security.

Cold wallets are one of my main use case. So, dear community, which software would you appreciate to find in such OS to securely manage your crypto assets ? (This question is not limited to Ethereum of Ethereum based tokens).

Thank you in advance for your feedback.