Similar to Mturk

Amazon Mechanical Turk

Amazon Product Advertising API

Amazon Vine

Blackle

Content Management Interoperability Services

Firebase Studio

FlexiScale

Romeo (social network)

Goodreads

Scribd

SlideShare

Web Services Description Language

Windows CardSpace

IFTTT

Windy (weather service)

Airliners.net

OpenSeaMap

Semantic Web

DataNucleus

NORAD Tracks Santa