Neural network training data sets.
https://chartio.com/learn/data-analytics/where-to-find-free-datasets/
https://github.com/awesomedata/awesome-public-datasets
https://www.kaggle.com/datasets?tags=13302-Classification&page=25
https://www.kaggle.com/datasets/vishweshsalodkar/wild-animals
https://www.kaggle.com/datasets/hojjatk/mnist-dataset
http://yann.lecun.com/exdb/mnist/
https://github.com/SorourMo/38-Cloud-A-Cloud-Segmentation-Dataset
https://www.dataquest.io/blog/free-datasets-for-projects/
https://www.reddit.com/r/datasets/comments/3bxlg7/i_have_every_publicly_available_reddit_comment/
https://archive.ics.uci.edu/ml/datasets.php
http://archive.ics.uci.edu/ml/machine-learning-databases/
https://registry.opendata.aws/
https://aws.amazon.com/datasets/google-books-ngrams/
https://registry.opendata.aws/usgs-landsat/index.html
https://github.com/fivethirtyeight/data