Tinn-R

Dear Sir or Madame

At our university we use the program "R" and "Tinn-R", but they don't  
know how/where to download this program for Mac-users...could you  
please help me? Is Tinn-R for Mac called by an other name?

I'm looking forward to hearing soon from you part.
Thank a lot

Ternia Naduvathumuriyil