راہنما آن لائن لائبریری
A lot of ebooks on different subjects available for free download at following site.
http://ebooks.rahnuma.org
Disclaimer: I may not agree with the content and may not have read them all. So you can download at your own risk.
To read the books you may open them online or download ebook on your PC and read at your leisure. I also recommend people to install "eBookDroid” application on your Android phone and download these books on your phone or Tablet and read whenever you wish, opening a book where you left.