What are the best free eBook sites? Ideally:
1. eBooks should be free to download
2. Most common formats like .epub and .lit are okay but pdf is most preferred.
3. eBooks should cover relevant subjects and fields, e.g. I am looking for Life Science related books for my Biotech field
4. When you click on download button, you should not be redirected or popups asking for surveys.
5. Has a good user base and forums to dicuss opinions and feedback about eBooks.