Where do you find the best open datasets for AI experiments?

I'm curious to know where others source high-quality, diverse datasets for their AI projects. Whether it's for training machine learning models, experimenting with deep learning, or exploring niche applications, a good dataset is crucial. Some popular sources I've explored are: 1. Kaggle Datasets: A wide variety of datasets for every domain. 2. Google Dataset Search: A powerful tool to find datasets across the web. 3. UCI Machine Learning Repository: Great for classic ML datasets. 4. Hugging Face Datasets: Amazing for NLP tasks. Are there any underrated or niche resources you'd recommend? Let's share and build a comprehensive list!" Would you like to add or refine this further?