1、UC Irvine Machine Learning Repository:http://archive.ics.uci.edu/ml/
2、Kaggle datasets:https://www.kaggle.com/datasets
3、Amazon's AWS datasets:http://aws.amazon.com/fr/datasets/
4、http://dataaportals.org/
5、http://opendatamonitor.eu/
6、http://quandl.com/
7、Wikipedia's list of Machine Learning datasets:https://goo.gl/SJHN2k
8、Quora.com question :http://goo.gl/zDR78y
9、Datasets subreddit:https://www.reddit.com/r/datasets