The following links will take you to Masonic websites where you can browse from a list of many different Freemason books which are in .PDF format.
If you are curious about the craft and want to learn more about Freemasonry, the links to other Masonic websites which offer them are below.
Disclaimer - In linking to these, I am under the assumption that each of the books is in the public domain and not currently under copyright. If you find any books or articles which are still under copyright, and are not free to download or read without authorization, please contact me and I will remove the link to them. Thank you.