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? hey mate, thanks for this question cuz i was curious too. i used to read airdrop threads and found some sites there, but i still haven't found the one that suits me perfectly