Datasets & Labeling

The U.S. government’s open data portal aggregating hundreds of thousands of datasets.

Leading open-source image/video annotation with auto-annotation and team workflows.

Open platform to share datasets, tasks, and benchmarks for machine learning.

Dataset management and curation—debug models, fix labels, and improve data quality.

Classic collection of ML datasets used in research and education.

AI-assisted annotation and services with workflow, QA, and multimodal support.

Social data catalog to share, query, and collaborate on open datasets.

Professional CV labeling with model-in-the-loop and medical/video tooling.

CERN-hosted open repository for research data with DOIs and long-term preservation.

AI + HITL labeling with customizable workflows, analytics, and ontology management.

Free, open web-crawl corpus for large-scale text/data mining.

Developer-centric annotation tool with strong active learning for NLP/CV/A/V.

Meta-search across millions of datasets on the web with schema.org-powered indexing.

Large-scale annotated image dataset with boxes, masks, relationships, and more.

Open-source text annotation for classification, NER, and seq2seq tasks.