Not sure if it is good or not. This book fair will be going on for a month. Website claims there are 1/3 million e-books available for free access download.

http://worldebookfair.com/

World eBook Library Catalogs and Collections

The World eBook Library Consortia Collection shelves more than 330,000 PDF eBooks in 100+ languages contained in 112 of the finest eBook and eDocument collections published on the Internet today. The mission of the World eBook Library's Acquisition Department is to add new eBooks 24/7 to our shelves.

For Technical E-Books, go to
http://worldebookfair.com/Technical_eBook_Colleciton.htm