[HelpDesk] Helpdesk question via web

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Form data:
  Name: Barbara
  EMail: mcbricker at aol.nl
  OS: MAC OS X
  UserAgent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; nl; rv:1.8.1.5) Gecko/20070713 Firefox/2.0.0.5
  IP: 82.157.247.56
  Time: Thu Aug  9 05:44:55 2007

Hi,
simple question: Does LDrw also exist for the MAC?
I saw there are some programs for the Mac. But actually I don't know anything about LDraw, so I was a little bit puzzled, what's important and what isn't.
Thanks for help,
Barbara