A list of sites where you can download computer ebooks for free!
O’Really Open Books Project: the ebooks of the famous publisher: computer, programming, etc…
Wikibooks: the Wikipedia of ebooks.
Free tech books: a huge database of computer ebooks that you can download for free.
Bookboon Adobe, Artificial intelligence, C, C++ e C#, Information systems and Management, Java, Microsoft Office, others ebooks.
FreeComputerBooks many categories: programming, operating systems, networking, databases, mobile etc…
Ebookee: operating systems, web, programming, game development, secuirty/hacking, hardware and much more.
ebook3000: programming, web development, databases, graphic design, etc…
OnlineProgrammingEbooks ebooks about various programming languages.