This is just a short list of a few books that I have have recently discovered online.
- Model-Based Machine Learning – Chapters of this book become available as they are being written. It introduces machine learning via case studies instead of just focusing on the algorithms.
- Foundations of Data Science – This is a much more academic-focused book which could be used at the undergraduate or graduate level. It covers many of the topics one would expect: machine learning, streaming, clustering and more.
- Deep Learning Book – This book was previously available only in HTML form and not complete. Now, it is free and downloadable.
Source: 101 DS – Recent Free Online Books for Data Science