Canadian Museum of History
Canadian Museum of History: Maya Civilization
Lots of information about many facets of the Maya civilization. Covers the history, people, geography, languages, cities, society, cosmology, the calendar, and lots more. Includes a glossary and a timeline.
University of St. Andrews (UK)
University of St. Andrews: Mayan Mathematics
After a historical introduction, this site from the University of St. Andrews provides information about the mathematics of the Maya Civilization and shows just how advanced they were.