Research Guides: *Social Science Data Resources: Machine Learning Data Repositories

Dataset Repositories

Kaggle
Registry of Open Data on AWS
UCI Machine Learning Repository
The UCI Machine Learning Repository is a collection of databases, domain theories, and data generators that are used by the machine learning community for the empirical analysis of machine learning algorithms.
Google Datasets Search
Dataset Search lets you find datasets wherever they’re hosted, whether it’s a publisher's site, a digital library, or an author's personal web page. To create Dataset search, we developed guidelines for dataset providers to describe their data in a way that Google (and other search engines) can better understand the content of their pages.
Microsoft Research Open Data
A collection of free datasets from Microsoft Research to advance state-of-the-art research in areas such as natural language processing, computer vision, and domain specific sciences.
Awesome Public Datasets
Visual Data Discovery
Lionbridge AI
Quora: List of Publicly Available Datasets

Several governments host public data

GDELT
"GDELT is the largest, most comprehensive, and highest resolution open database of human society ever created. [GDELT] monitors the world's news media from nearly every corner of every country in print, broadcast, and web formats, in over 100 languages, every moment of every day and that stretches back to January 1, 1979 through present day, with daily updates."
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The entire GDELT database is 100% free and open and you can download the raw datafiles, visualize it using the GDELT Analysis Service, or analyze it at limitless scale with Google BigQuery.
Alpha Vantage Stock Data API
API access to stock time series, foreign exchange rates, cryptocurrencies, and a variety of technical indicators. Refer to the supplementary stock market API integration guide for sample Python code scripts and machine learning best practices.
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From the FAQ:
"We are pleased to provide free stock API service for ... up to 5 API requests per minute and 500 requests per day. If you would like to target a larger API call volume, please visit premium membership.
"Note: If you are from a college or university and would like to use our data for academic purposes (e.g., research, teaching, etc), please reach out to support@alphavantage.co for academic data inquiries."