National Archives Experience is an excellent resource for the billions of primary sources offered through the general National Archives. The National Archives Experience does not simply give students access to original documents, but it also offers them in a curated collection organized by subject tags.
Newseumed consists of primary sources, news artifacts, and lessons all pertaining to civics and history. It allows you to search original news sources by state, century, theme, type of source, etc. Whatever source that you find can be share by URL for two weeks. It can also be renewed an unlimited number of times. Want to learn more about this cool resource? Check out this quick video.