There are many eBook resources - reference titles, collections from many publishers (Springer is the largest publisher represented) known for scholarly and professional title releases. There are scholarly societies and commercial publishers represented/. They are all identified in UC Library Search as "available online" and many are listed on different Subject Guides. Examples of these include the following collections and there are many more listed in UC Library Search:
There are many eBooks from trade publishers on different platforms listed on the EBooks Guide.
The professional societies, especially in Engineering are listed on the professional society websites. These include:
eBook collection of titles from CRC Press.