Books24x7 ITPro
Now Skillsoft Books ITPro!
Skillsoft Books ITPro (formerly Books24x7)
e-books on information technology in English. |Skillsoft Help and Tutorials| Skillsoft Search tips|
eBook Collection (Ebsco) 
Ebook Central
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Knovel
, Thousands of e-books and reference books from several subject areas in engineering and technology.
Dawsonera
|Help|Dawsonera's e-book service has stopped on 31.7. These e-books can be found via Janet. (VLeBooks).
Google Books
More literature
arXiv.org, ArXiv is an e-print service in the fields of physics, mathematics, non-linear science, computer science, and quantitative biology
Google Scholar, a freely accessible search engine for scholarly literature. Google Scholar quick guide
CiteSeerX, an evolving scientific literature digital library and search engine that focuses primarily on literature in computer and information science.