1/ https://beta.bounty0x.io
2/ https://app.bountyportals.com
3/ https://bountyplatform.io
4/ https://bountyhive.io
5/ https://bounties.biz
6/ https://bountysuite.com/bounty-programs.html
7/ https://my.bountyguru.com
8/ https://www.trackico.io/bounties

just signup, verify email, login to account, linked your facebook&twitter profile
now you can "hunt"

OR search from bitcointalk forum