GitHub has an extensive list of free E-books with a special emphasis on computer programming. There’s everything from A to Z – well, almost everything – the list goes from Ada to xBase (but there are no entries for K, Y and Z.)
For Linux fans, there are 33 books under the Linux sub-heading, a dozen books on bash scripting, and more than six dozen on Python.
There are also a number books on more general topics such as operating systems, networking, and computer security.
In total there are many hundreds of books listed and, since the price is right, the list may be well worth a look.