Através da B-on é possível aceder a e-books de editoras e bases disponíveis na Biblioteca do Conhecimento Online:
DOAB – Directory of Open Access Books – http://www.doabooks.org/
Editora Springer – http://link.springer.com/
OAPEN – http://www.oapen.org/home
Colecções de eBooks em acesso livre:
Biblioteca Digital Mundial (World Digital Library) – http://www.wdl.org/pt/
Bookboon.com – http://bookboon.com/en/environmental-engineering-ebooks
Bookshelf – http://www.ncbi.nlm.nih.gov/books/
E-Books Directory – http://www.e-booksdirectory.com/
FreeBookCentre.net – http://www.freebookcentre.net/Biology/Biology-Books-Online.html
FreeBooks4Doctors – http://www.freebooks4doctors.com/
Free-eBooks.net – http://www.free-ebooks.net/
Free Medical Books – http://www.e-booksdirectory.com/medical.php
FreeScience – http://www.freescience.info/Medicine.php
MedicalStudent.com – http://www.medicalstudent.com/
