Science Books Online is a directory of free science texts, e-books, monographs, lecture notes, and other science related documents. All texts are available for free access, authorized by their respective authors or publishers -- no pirated books here!
This website is now completely revamped and accommodated to mobile and tablet users. For desktop users the look is almost the same as before. Now you can use the drop-down menu near the upper-left corner of the screen to instantly access the main book categories.