Packt's free ebook of the day, which continues free until 7 p.m. ET U.S. tomorrow, is Practical Machine Learning.
Head to
this webpage in order to get the ebook.
If you don't have an account with Packt, I think that you will have to register first. However, once you've registered, you do not have to log in when you visit the webpage (why can't all ebook vendors do this? It probably helps that the folks at Packt are experts at coding . . . .).
Packt maintains a library, at their website, of the books that you have purchased from them. You might wish to visit the thread, "If You Had a Library with WTS Books, It's GONE Now!" in the E-Book General forum, and other relevant threads, in that forum and others, to read about the importance of downloading and backing up ebooks located on the ebook companies' websites.