一. http://www.hongkiat.com/blog/20-best-websites-to-download-free-e-books/
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FreeBookSpot
FreeBookSpot is an online source of free ebooks download with 4485 FREE E-BOOKS in 96 categories which up to 71,97 GB.
You can search and download free books in categories like scientific, engineering, programming, fiction and many other books. No registration is required to download free e-books.
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4eBooks
4eBooks has a huge collection of computer programming ebooks. Each downloadable ebook has a short review with a description. You can find over thousand of free ebooks in every computer programming field like .Net, Actionscript, Ajax, Apache and etc.
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Free-eBooks
Free-eBooks is an online source for free ebook downloads, ebook resources and ebook authors. Besides free ebooks, you also download free magazines or submit your own ebook.
You need to become a Free-EBooks.Net member to access their library. Registration is free.
详细内容点击：http://www.hongkiat.com/blog/20-best-websites-to-download-free-e-books/
二. http://www.hongkiat.com/blog/20-best-websites-to-download-free-e-books-part-ii/
三. 皮皮书屋（IT方面）：http://www.ppurl.com/login/