- Free Educational Texts (https://www.freeeducationaltexts.org/): This site offers a wide range of free educational books, including the first nine Bob Books.
- Storyweaver (https://storyweaver.org.in): This site provides a collection of open educational resources, including several of the Bob Books.
- The Reading Village (http://www.thereadingvillage.com/books): This site offers free access to a variety of leveled readers, including some of the Bob Books.
- Internet Archive (https://archive.org/details/bobbooksbylynnherdtbooksinseries0109): This site provides a collection of free books, including several of the Bob Books.
- World Literacy Crusade (http://www.wlcministries.org/freedownloads/): This site offers free downloads of a variety of educational resources, including some of the Bob Books.