Amazon Mechanical Turk - The online market place for work.
Monosnap - Monosnap is a comprehensive screenshot taking software system that provides users with a fast and accessible way to take screenshots whenever they want. Read more about Monosnap.
Supervisely - Supervisely helps people with and without machine learning expertise to create state-of-the-art...
Annotate - Annotate (formerly know as Glui) is the simplest way to capture, annotate and share screenshots.
Labelbox - Build computer vision products for the real world
LabelMe Annotation Tool - LabelMe is an annotation tool writen in Javascript and Perl for online image labeling.