SEOClerks - The largest SEO Marketplace on the planet. - SEOClerks
CrowdFlower - Enterprise crowdsourcing for micro-tasks
Picoworkers - Earn money from doing short, easy tasks similar to Microworkers. Picoworkers is the best alternative to Microworkers I ever find.
Amazon Mechanical Turk - The online market place for work.
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.
Universal Data Tool - Machine learning, data labeling tool, computer vision, annotate-images, classification, dataset