Most from just staking LUNA on Terra. There are a couple projects that have also airdropped to stakers of ANC on Anchor (on Terra)But do you get that from just staking Luna with Terra, or do you need to stake Luna in all of these individual projects and wait for the airdrop?
https://terra.smartstake.io/airdrops shows most of the active airdrops plus the number of staked LUNA you have to have to make the airdrop claim break even.