Free AI Tools for data labeling

OpenTrain AI is a talent network and workspace for hiring vetted AI trainers, data labelers, and domain experts for model training and evaluation.

Scale AI provides data infrastructure and AI evaluation tools to help organizations build, train, and deploy reliable AI systems.

Labelbox is an AI data platform for generating, evaluating, and managing training data for advanced AI teams.

clickworker provides crowdsourced data services for AI training, labeling, surveys, testing, tagging, and research tasks.