Right now the most attractive one is DeepOnion. It is just unbelievable. Every week, (for legendary ranked members) they are giving away as much as $1,000 worth of coins. If you participate in all the 40 rounds, it means that you earn $40,000 without any work at all. And that particular currency is having a very high potential for price increase.
I signed there and didnt receive anything. Also used their wallet but it wont connect to their network.
Deeponion is a great project and i am part of that concept and getting my weekly bounty. You have to join their community site
https://deeponion.org/ and apply here
https://deeponion.org/community/apply.php. They check your account and if found ok, you accepted to their airdrop. They have strong community and you get reply of your any query posted in their bcd thread.