Luminarium
Luminarium: Middle English Literature (1350 1485)
Listed as Medieval literature, you can find authors from the 14th and 15th centuries here, as some are considered Renaissance writers. Excellent resource with links to extensive info on the writers including Chaucer, Langland, and Gawain.
Bartleby
Bartleby.com: Early English Comedy
Short discussion of John Heywood and his role in the development of English comedy. Includes some info on Heywood's plays.
University of Victoria (Canada)
University of Victoria: Morality Plays
This resource provides a brief history of the development of morality plays in medieval theatre.