Amazon Mechanical Turk - The online market place for work.
Fiverr - One marketplace, millions of professional services.
Bitfortip - Tip Bitcoins as an incentive | Earn Bitcoins for being helpful
Upwork - Forget the old rules. You can have the best people. Right now. Right here.
Crowdin - Localize your product in a seamless way
HireOwl - Hiring students for internships and freelance projects