The ACM has made a number of books free to download, expiring very shortly. Among the offerings, these might be of interest here:
- Ada’s Legacy: Cultures of Computing from the Victorian to the Digital Age
- Smarter Than Their Machines: Oral Histories of Pioneers in Interactive Computing
- Communities of Computing: Computer Science and Society in the ACM
- Edmund Berkeley and the Social Responsibility of Computer Professionals
- Computing and the National Science Foundation, 1950–2016: Building a Foundation for Modern Computing
- Making Databases Work: the Pragmatic Wisdom of Michael Stonebraker
- Code Nation: Personal Computing and the Learn to Program Movement in America
(See also the related offerings on programming languages, with much of historical interest: Proceedings of the ACM on Programming Languages - Volume 4, Issue HOPL June 2020)