After going some diggings I might have come across the first of its kind multi-chain wallet and why won't I bring that for my famz on here maybe I am missing out on something?
Airgap is not the only open source multichain wallet, and it is mostly used in combination with their Airgap vault app as cold storage, and free alternative for hardware wallets.
I know few other open source wallets that can be used, one is called Unstoppable.money and it can be used only on smartphones.
Second wallet is called AtomicDex, it can be used as a wallet and as exchange with atomic swaps, and this can be used both on computers and on smartphones.
Safest option is using Trezor Suite app in combination with Trezor hardware wallet, but this is not free option.