We can earn Ethereum without any investment by doing these things,


1. Mining
2. Bounty
3. Airdrops
4. Referral Campaigns


                   We can earn ETH form doing these options. Personally, I'm doing bounty and earn ETH. I have made 27 ETH from doing bounties. If you received bounty tokens, you can easily convert it to eth using by Exchanges. But in current most of the bounties are fake. So be careful before participating in any bounty.