무료 전자책 ( 전자도서 ) free ebooks

Gutenberg
http://www.gutenberg.org/

obooko
http://www.obooko.com/

programming books

http://www.onlineprogrammingbooks.com/

freetech books

http://www.freetechbooks.com/

참고

http://www.techsupportalert.com/free-ebooks-audio-books

http://www.getfreeebooks.com/?cat=112

http://www.freemake.com/blog/20-best-websites-to-download-free-ebooks/

http://www.ebizmba.com/articles/social-bookmarking-websites