Mayan Epigraphic Database: A relational database of Mayan glyphs, images, phonetic values and semantic values.
The Maya Site: Searchable database accompanying the 40,000-entry "The Mayan Languages - A Comparative Vocabulary".
Transitivity Alternations in Yucatec, and the Correlation Between Aspect and Argument Roles: Article by M. Kraemer and D. Wunderlich, analysing the argument structure of Mayan Yucatec.