For airgapped signing devices like SeedSigner, Sparrow is the best I've come across. Not totally sure, but
Specter is also used for airgapped multi-sig purposes. For mobile, I think
BlueWallet can be used for airgapped signing, but I wouldn't recommend using a mobile device for that use, as they're designed to connect to as many networks as possible (which is the opposite of airgapped).
I don't think there's multi-sig taproot support in any of these wallet software yet.
Correct me if I'm wrong, but if I use airgapped hardware wallets to sign, it doesn't really matter what app I use. When I sign (on the hardware wallet) that device will tell me how much bitcoin I'm about to send and to which address. So there is no way it can steel my bitcoins, right?
I will check to the wallets you mention, thanks for the suggestions!