Croatia: An Overview of its History, Culture and Science
From Darko Zubrinic, a cultural overview of Croatia's history, culture and science. Somewhat slow loading because of its soundtrack.
Croatia: Portals to the World
From the US Library of Congress, the Portals to the World includes modern and historic information about the country of Croatia.
A website on the Pupicina Cave Archaeological Project, a cave with both Upper Paleolithic and Mesolithic occupations, although not much there right now, assembled by Paolo Pellegatti at Berkeley.
From Preston Miracle at Cambridge, a page describing the plans for excavation and preservation at Pupicina Cave.