I dunno if these have taken snapshots already but Lamina1 and Timeswap are likely to do retrospective airdrop.

Also, this guy I came across few days ago on X posts solana stuff, from gambles of his list— FluxB, Jupiter, Jito have announced airdrop: https://twitter.com/MetisCharter/

Fun fact: he posted solana guide on nov 2, and in there we were to use Jupiter, meanwhile Jupiter snapshot was also taken on nov 2.