Fordham University provides a list of links to online primary sources from the classical era.
Provides links to all of the museums and universities around the world that contain cuneiform artefacts. Most links provide translations of the artefacts.
An online academic database used by universities worldwide that is a superb resource for History students. To view full articles, you will require membership.
This searches internet sites for academic articles and books. It often only provides one or two pages, but it is often enough to find quotes and bibliographical details.