AfterQuery
Expert-written SFT data, evaluation rubrics, agent environments and computer-use trajectories for frontier models.
LLM & human feedback
Managed service
Website THE AI DATA INDEX · VOL. 01
Good models start
with the right data.
A field guide to the companies supplying AI’s raw material.
From human feedback to the physical world. Find your next data partner.
e.g. egocentric
Platform
Website 
Managed service
Website 
Platform + services
Website Anolytics
Data annotation and collection across text, speech and computer vision.
Annotation & collection
Managed service
Website 
Platform
Website 
Appen
Global human-data programs spanning alignment, speech, multimodal and physical AI.
LLM & human feedback
Managed service
Website Awign
Distributed workforce for egocentric video capture and AI data annotation.
Robotics & egocentric
Managed service
Website 
Marketplace
Website 
Platform + services
Website 
Datasets + services
Website 
Calliope Networks (Protege)
Audiovisual content licensing for AI training; now part of Protege.
Video & licensing
Licensing
Website 
Centaur.ai
Expert labeling and human-AI aggregation for healthcare and other specialized training datasets.
Specialist datasets
Managed service
Website 
Centific
Multimodal data creation, curation and evaluation for enterprise AI.
Annotation & collection
Platform + services
Website 
Datasets + services
Website 
CloudFactory
Managed human-in-the-loop operations and data annotation for AI teams.
Annotation & collection
Managed service
Website Managed service
Website 
Data API
Website 
Dappier
Publisher content monetization and AI answer experiences for publishers and advertisers.
Data marketplaces
Platform
Website 
Data API
Website 
Databricks Marketplace
Open marketplace for data products, models and analytics assets.
Data marketplaces
Marketplace
Website 
DataForce
Global collection, annotation and linguistic data services from TransPerfect.
Annotation & collection
Datasets + services
Website Platform
Website 
Datasaur
Text and audio labeling software for NLP and language-model development.
Annotation & collection
Platform
Website Showing 24 of 129 · Company positioning summarized from linked sources · Reviewed September 10, 2026
THE DATA YOU CAN’T FIND YET
Some datasets need to be made.
Tell us what your model needs to learn. We’ll start with the humans.
A NOTE ON THE INDEX
A starting point for better sourcing.
This is a curated directory of data suppliers, marketplaces and collection tools, published by Ocal. Each listing links to its source. Inclusion isn’t an endorsement or a claim that a vendor sells every dataset off the shelf. Availability and usage rights depend on the provider and agreement.
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