Comprehensive Collection of Open Data Sources and Datasets for AI and Data Analysis

1. Data Query Websites

Enterprise user data sources such as Baidu Index, Alibaba Index, Tencent Browsing Index (TBI), and Sina Weibo Index; commercial data platforms like DataTang, Guoyun Data Market, and Guiyang Big Data Exchange; government and institutional open data from the National Bureau of Statistics of China, World Bank, United Nations, and Nasdaq; and consulting firms like McKinsey, Accenture, and iResearch.

2. Simple Universal Datasets

National statistical data from China, US government open data (data.gov), Indian government open data (data.gov.in), World Bank Open Data, and RBI (Reserve Bank of India) datasets.

3. Large Datasets

Amazon Web Services datasets (including Enron emails, Google Books n‑grams, NASA NEX, Million Song), Google BigQuery public datasets (GitHub, Hacker News), and YouTube‑labeled Video Dataset.

4. Predictive Modeling and Machine Learning Datasets

UCI Machine Learning Repository, Kaggle datasets, Analytics Vidhya contests, Quandl financial/economic data, and past KDD Cup competition data.

5. Image Classification Datasets

MNIST handwritten digits, Chars74K character images, CMU/MIT frontal face images, and ImageNet.

6. Text Classification Datasets

Spam vs. Non‑Spam SMS corpus, Twitter Sentiment Analysis corpus, and Cornell Movie Review data.

7. Recommendation Engine Datasets

MovieLens dataset and Jester joke recommendation dataset.

All sources are cited with their respective URLs for easy access.