Recently there was HWC but their airdrop period has ended but you can join airdrops like RBlock, the airdrop is well organized and promising. others are tokenpay, prochain is also ending soon if it has not ended, there is eaglecoin and they also have airdrop and so many to even remember. the best option is to check the the forum as the time permits you it is always better that way because no matter how much people may want to inform you about the available coin or airdrop, they too need the time to do their own things. devote some time and go over as much as you can.