Secret Headstash
This is an airdrop contract that can verify an ethereum signatures containing a secret pubkey address in ordrer to transfer snip20 tokens to.
The wallet claiming the airdrop must be the same wallet address that was signed by the ethereum account, bringing some certainty the wallet claiming has ownership of the eth account.
Cross Chain
This is included in the cross-chain category as this provides ethereum communities and also any communities making use of ibc compatible tokens with a private token distribution option on Secret Network.