Common Crawl
Free, open web-crawl corpus for large-scale text/data mining.
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UCI Machine Learning Repository
Classic collection of ML datasets used in research and education.
doccano (OSS)
Open-source text annotation for classification, NER, and seq2seq tasks.
Scale Nucleus
Dataset management and curation—debug models, fix labels, and improve data quality.
Roboflow Universe
Huge community hub of computer-vision datasets and pre-trained models.
Ollama Library (for local label assist & synthetic data)
Run open-weight LLMs locally to assist labeling or generate synthetic datasets.
Labelbox
End-to-end data engine with AI-assisted labeling, curation, and evaluations.
Encord Annotate
AI + HITL labeling with customizable workflows, analytics, and ontology management.
Open Images Dataset
Large-scale annotated image dataset with boxes, masks, relationships, and more.
Google Cloud Public Datasets
Curated, analysis-ready public datasets hosted on Google Cloud/BigQuery.
Kaggle Datasets
Community-driven repository of datasets with notebooks, discussions, and trending signals.
Label Studio (OSS)
Open-source, highly configurable labeling for text, images, audio, video, and chat.
Prodigy
Developer-centric annotation tool with strong active learning for NLP/CV/A/V.
V7 Darwin
Professional CV labeling with model-in-the-loop and medical/video tooling.
Registry of Open Data on AWS
Discover public datasets available via AWS resources with examples and tutorials.