This is the ejournal platform provided by The University of Chicago Press. (Subscribed ejournals are only available.)

Project Euclid is the ejournal platform in mathematics and statistics which is provided by Cornell University Library and Duke University Press.
Not only the subscribed titles, but also about 80% of the papers hosted on Project Euclid are openly available.

This database contains the American Antiquarian Society's collection of American magazines.
It contains over 6,000 titles published between the late 17th and early 20th centuries. Over 7 million pages in total.

This is the ebooks and ejournals platform of World Scientific Publishing. (Subscribed titles are only available.)

This site provides ejournals published by Japanese publishers, mainly in the fields of medicine, pharmacology and nursing. (Subscribed ejournals are only available.)

This is the ejournal platform which is provided by Karger. (Subscribed ejournals are only available.)

This is the ejournal platform which is provided by Royal Society of Chemistry (RSC). 

This is the ebooks and ejournals platform provided by Oxford University Press. (Subscribed titles are only available.)
In addition to Oxford University Press, the platform also provides access to eBooks from the world's leading university presses, ranging from the humanities and social sciences to medicine.

This is the ejournal platform of Institute of Physics. (Subscribed ejournals are only available.)

JAMA Network is the E-journal collections produced by American Medical Association. (Subscribed ejournals are only available.)