These links include a university repository, an open access database, and industry organizations that may require membership to access all resources. Some have job boards, webinars and articles about different engineering fields.
"Welcome to ICE Virtual Library from ICE Publishing, the most comprehensive online civil engineering resource in the world. Here you can explore our archives back to 1836, browse ICE Publishing's internationally renowned journals and access over 1,500 eBooks to find the information you need."
Freely available but requires registration for a username to access. The Materials Project provides open web-based access to computed information on known and predicted materials as well as powerful analysis tools to inspire and design novel materials.
You may create an account and download many books for free. Topics include agriculture, biology, computers, energy, the environment, engineering, food, medicine and health, space, social sciences, transportation, and more.