The EEBO contains the full text of 100,000 early English works from 1470-1700. The subject areas include: English literature, history, philosophy, linguistics, theology, music, fine arts, education, mathematics, and science
Provides access to unique primary source materials that document political reform and revolution, nationalism and nation building, the expansion of empire and colonialism, growing literacy and education, and the flowering of both popular and high culture and consists of four parts: Children's Literature and Childhood; Women and Transnational Networks; Religion, Reform, and Society; Europe and Africa, Colonialism and Culture.
See also Gale Primary Sources and Archives Unbound
Most of the texts listed on these sites are in the public domain.