There are a lot of airdrops going on that give you free tokens for just leaving your email and ethereum address. OMG, Qtum, Stellar and many more were airdropped for free.
The only website I found is
http://airdropalert.com/ and it sucks. Many current airdrops are not being listed.
Does anyone have a better one?I suggest you join a telegram channel around airdrop, you can search their channel's url link on google, because if you join the telegram channel that discusses airdrop, you will get faster notifications than by seeing the website every day, inefficiently.