需科学上网
备用域名：wdl.org
哈佛、MIT、斯坦福、牛津、北大、清华等140+所大学机构在线课程
免费经典文学
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类似站点：idoc.pub（需科学上网）
PDF Room is a search engine where you can find educational and recreational PDF books
搜索功能使用google，需要科学上网
Download Free Kindle ePub eBooks
IT电子书
a volunteer-driven effort to produce a collection of high quality, carefully formatted, accessible, open source, and free public domain ebooks that meet or exceed the quality of commercially produced ebooks.
free computer science ebooks
需科学，Internet Archive的National Emergency Library （国家紧急图书馆）
Free Download eBooks Search Engine
download free ebooks
a high quality resource for free PDF books
Database of Free / Open Access Online Computer Science Books
Links to Free Computer, Mathematics, Technical Books all over the World
免费注册，每个月免费下载5本书
Free ebooks library
OpenStax publishes high-quality, peer-reviewed, openly licensed textbooks that are absolutely free online and low cost in print
Project Gutenberg is a library of over 60,000 free eBooks
Have a nice day with a new knowledge
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library to the world
Forgotten Books is a London-based book publisher specializing in the restoration of old books, both fiction and non-fiction.
类似网站 ebook3000.com
Springer免费教材
