If you know a good science ebook site send it to me at jackmerrin@gmail.com

Try these sites you can find some good stuff.

physicsdatabase.com
www.sciencebooksonline.info/
https://www.free-ebooks.net
www.freescience.info/
bookboon.com/en/natural-sciences-ebooks
www.e-booksdirectory.com
freemathbooks.com/
www.openculture.com
www.freebookcentre.net/
Freetechbooks.com