IEEE Electronic Library (IEL) - IEEE
The IEEE Electronic Library (IEL) is your single source for more than 30% of the world’s current literature in electrical engineering, electronics, and computer science. Through IEL you can access: journals, conference proceedings and standards from IEEE, plus select content dating as far back as 1872. More than 3 million articles, over 160 IEEE journals, magazines and transactions, and proceedings from IEEE conference titles. Over 2,400 approved and published IEEE active standards.
Synthesis Digital Library of Engineering and Computer Science - Morgan & Claypool
Provides access to content on many topics in engineering and computer science. Content is organized into subject series containing 50-250 page reviews called "lectures" on advanced topics in the field.