The Fundación Juanelo Turriano. Digital Library “The foundation’s mission is to further the study of the history of the various branches of science and technology, with particular emphasis on the history of engineering.” http://www.juaneloturriano.com/en/creation-and-objectives
Internet Archives, “The Internet Archive was founded to build an Internet library. Its purposes include offering permanent access for researchers, historians, scholars, and the general public to historical collections that exist in digital format.” https://archive.org/about/
Virginia Tech, Digital Library and Archives, Journal of Technology Education http://scholar.lib.vt.edu/ejournals/JTE/
Mises Institute Library, “The Mises Library is an extensive online offering of the literature and media of the Austrian School and libertarian thought. The Mises Institute makes available many thousands of books, thousands of hours of audio and video, along with the full run of rare journals, biographies, and bibliographies of great economists — all for free.” https://mises.org/library
Project Gutenberg, “Project Gutenberg began in 1971 by Michael Hart as a community project to make plain text versions of books available freely to all.” https://archive.org/details/gutenberg