Crowdsource – Complete micro-tasks like image search engine evaluation, transcription, website categorization and writing.
Clickworker – Clickworker pays you to complete a variety of tasks. The average person makes around $9 per hour, but it really depends on the task you complete. Pay is via Paypal. ( Can be full-time income)
Prolific Academic – Prolific Academic is relatively new crowdsoucing platform that include tasks and surveys geared towards studies and science. Much higher pay then most croudsource websites.
Crowdflower – Complete different tasks among different reward websites. Payout minimum varies by site.