Medieval and Renaissance History 

• About.com: Medieval History
  An extensive list of resources about life, art, culture, and war in the Middle Ages.
• The Civilization of the Renaissance in Italy
  Online textbook about the Italian Renaissance.
• Eyewitness to History: The Middle Ages and Renaissance
  Exerpts from primary sources with explanatory text.
• Heraldry Coats of Arms from Ireland and Around the World Heraldic Charges Heraldic Dictionary A Heraldic Primer Herladica Heraldry on the Internet Shields, Knights, and Heraldry
• Internet Medieval Sourcebook
  Annotated links to primary sources on various topics in medieval history, edited by Halsall.
• The Labyrinth: Resources for Medieval Studies
  "The Labyrinth provides free, organized access to electronic resources in medieval studies through a World Wide Web server at Georgetown University. The Labyrinth's easy-to-use menus and links provide connections to databases, services, texts, and images on other servers around the world."
• Life in Elizabethan England
  Free online book about what life was like in the age of Elizabeth I.
• Medici: Godfathers of the Renaissance
  PBS site about the Medici family of Florence - patrons of the arts, bankers, and ruthless politicians.
• Medieval Conceptions of Time
  "This calendar of feasts and festivals is your introduction to medieval culture. ... there are five concentric circles which represent the different conceptions of time which coexisted in the Middle Ages.
• The Medieval Science Page
  "This page is intended to provide a convenient and comprehensive set of links to all Internet resources worldwide which deal with aspects of medieval science, both in Western and other cultures."
• The Middle Ages
  People, arts, literature, wars and weapons, and culture of the Middle Ages. Includes a special section on the Black Death.
• The Middle Ages, Chivalry, & Knighthood
  Nice set of subject-organized links, unfortunately somewhat out of date.
• Mostly Medieval: Exploring the Middle Ages
  "Here you will find information on heraldry, myths and legends, religion, medicine, and other aspects of life in Britain during the Middle Ages."
• NetSERF
  Subject directory to annotated links relating to the middle ages. Also offers current news about the period, with RSS feed.
• The ORB: Online Reference Book for Medieval Studies
  "The ORB is an academic site, written and maintained by medieval scholars for the benefit of their fellow instructors and serious students." Includes primary source material and online textbooks.
• Regia Anglorum
  "Regia Anglorum attempts to recreate a cross section of English life around the turn of the first millennium.....These pages are designed to be an interactive experience for anybody with an interest in Early Medieval Europe and in Anglo-Saxon and Viking Britain in particular."
• Renaissance Connection
  Discover the arts and sciences of the Renaissance.
• Renaissance Sites
  Extensive, annotated list of websites about the Renaissance, including primary sources. Organized by topic.
• WWW Virtual Library History Index: Medieval Europe
  Extensive set of links to sites relating to all aspects of Medieval European history and culture.