Bitbounce - Charge unsolicited email senders a cryptocurrency fee
Amazon Mechanical Turk - The online market place for work.
21 Lists - Send and receive targeted, paid microtasks
SerpClix - SerpClix is a click exchange network used to send more real clicks to your Google SERP. You can click to earn money or buy clicks to rank higher on Google.
BitcoinGet - Earn bitcoin by completing tasks, answering surveys, watching videos, and more.
Bitfortip - Tip Bitcoins as an incentive | Earn Bitcoins for being helpful