An online "bibliography of close to 500,000 records for articles, essays, books, and reviews" covering the Middle Ages and Renaissance (400-1700). Besides the Iter Bibliography itself, there are several other parts:

• Iter Italicum
• Renaissance Quarterly Online (RQ Online)
• International Directory of Scholars
• International Directory of Renaissance and Reformation Associations and Institutes
• Baptisteria Sacra
• Medici Archive Project
• Aestimatio: Critical Reviews in the History of Science
• The Electronic Capito Project

Journals indexed in Iter.