Programming books can be a valuable resource when you need to get up to speed on a language, pattern, or technology. They can also be plain old interesting. The other day I stumbled across a massive repository of free programming books that is being continuously updated.
The GitHub repository currently contains over 1,000 free programming books in over 130 categories. There is even a Meta List - a list of lists - with 16 entries containing even more free programming books. You’re likely to find any resource you need here.
This is a link every programmer will want to bookmark.