These collections do not fit under a particular category and contain primary sources from various eras.
The Internet History Sourcebooks Project: Compiled by Paul Halsall, a history faculty member at Fordham University. One of the premier sites for good primary sources on ancient, medieval, and early modern history as well as on specialized topics such as women, gender, African, East Asian, and many, many others.
World Digital Library: In its own mission statement, the World Digital Library (WDL) “makes available on the Internet, free of charge and in multilingual format, significant primary materials from countries and cultures around the world. ” It contains different primary source formats from images to transcriptions to facsimiles and is entirely Boolean-searchable.
HathiTrust: The HathiTrust Digital Library is a partnership of research institutions and libraries with the purpose of digitally preserving the written record. HathiTrust contains source collections from over 80 different partners covering a wide variety of topics. You do need access through an educational institution.
Internet Archive: This non-profit organization seeks to: “build…a digital library of Internet sites and other cultural artifacts in digital form. Like a paper library, we provide free access to researchers, historians, scholars, the print disabled, and the general public.” This resources contains numerous types of digitized primary sources, all uploaded from different libraries and collections around the world.