Fashion-MNIST is a dataset of Zalando’s article images—consisting of a training set of 60,000 examples and a test set of 10,000 examples. Each example is a 28×28 grayscale image, associated with a label from 10 classes.
TensorFlow Datasets is a collection of datasets ready to use. All datasets are enabling easy-to-use and high-performance input pipelines.
UC Irvine Machine Learning Repository
They have 626 datasets as a service to the machine learning community.