Amazon Mechanical Turk - The online market place for work.

LabelMe Annotation Tool - LabelMe is an annotation tool writen in Javascript and Perl for online image labeling.

Supervisely - Supervisely helps people with and without machine learning expertise to create state-of-the-art...

Datatang.ai - Datatang provides off-the-shelf AI training datasets, on-demand data collection & annotation solutions that power the world's most innovative artificial intelligence.

Labelbox - Build computer vision products for the real world

Predictly.co - Save time and resources with our state of the art human-in-loop Data annotation platform services to build your solution specific AI solutions. We help you with the data heavy lifting while your data scientists focus on business centric solutions.