i think you have some mistake only one link

www.book4me.org
needed account
with the exception of this link all is free

i have been using these websites since 4 months
and i have downloaded about 1000 books absolutely free

in some links
bookos.org
bookfi.org
booksc.org

u can download 7 books without account
after that u can register free account and download almost 20 books in every 24 hours period

lets try again

sometime their is some error in some links

but all ebooks are absolutely free