Airdrops are free cryptocurrency. Most are built on the Ethereum platform and function as tokens. To receive them you just need an ERC20 wallet like My Ether Wallet.

Then you can start your hunt for

AIRDROPS THAT MAYBE DON'T SUCK

https://docs.google.com/spreadsheets/d/1OoNKjUxXkp-g0Etn5XZdD8lD3FiUngY8GfDNNoAWGPc

Like this one.

https://gonetwork.co/airdrop

Winners of ETHWaterloo - the world's largest Ethereum hackathon. I bet you didn't know about that.

Check out the Google spreadsheet for an active, ongoing list of other airdrops that maybe don't suck. I update it daily.