Caught this in my Facebook News Feed. The Library of Historical Apologetics is a website whose aim is to be the
world’s leading resource for lay apologists, pastors, students, and scholars seeking historical apologetics materials for self-study, church classes, sermon preparation, and research. Our digital collection currently contains references to about 3,000 items with a focus on works in English from the 17th through the early 20th centuries.
Their advisory board includes William Lane Craig, Gary Habermas, Craig J. Hazen, and Dr. Robert B. Stewart. The site seems to be in the building progress right now as the 3,000 items are not yet available. They have a road map laid out for the next four years which seems promising. Keep watching this site, it could become a valuable resource for free (public domain) apologetics documents.
*UPDATE*
A few of the items are available at this location. Thanks to Tim for adding the link to the sidebar!