maya's
tortuga.com
13moon.com
lawoftime.org
13mooncalendar.com

astrodreamadvisor.com
Time Surfer for Mac OS X
Time Surfer is a unique program for discovering the cyclic interwoven timing frequencies of the Mayan Long Count, Tzokin, Haab and the Dreamspell Calendars. Time Surfer decodes the various challenging Mayan calendar systems into an easy to use application.
Dreamspell Calendar Software for PC and Mac OS 9
For Windows 3.1, Windows 95 and Windows NT, the software is now self-extracting, so you just need to run the file that you download and follow the instructions. For Mac users, the file is encoded in StuffIt format.