Guys I've come across the best bounty program of 2018. The link for it is as follows:
https://bitcointalk.org/index.php?topic=2917838
There are very good responses received from this ICO investment. Please follow the link for more details.
BitNautic is also providing airdrop scheme. The link for it is given below:
https://bitcointalk.org/index.php?topic=2941216