For airdrops you can check coinmarketcap.com but the chance of winning is very bleak as there are a lot of participants. You can also visit the child board bounties in this forum for airdrop, here is the direct link -
https://bitcointalk.org/index.php?board=238.0Do your own research before participating in any airdrop or bounties as there can be scam projects listed on that child board.
For ICO and IDO information you again check coinmarketcap and Coinlist they have some good projects listed.