Here is a list of the available datasets:
- Kaggel dataset: https://www.kaggle.com/datasets
- UCI machine learning: http://archive.ics.uci.edu/ml/
- Reddit: https://www.reddit.com/r/datasets/
- An awesome GitHub repository that contains a list of public datasets: https://github.com/caesar0301/awesome-public-datasets
- Google Advanced Search is also handy when you are searching for datasets: https://www.google.co.in/advanced_search