R editor for Mac

Hello,

I have never used R before and I need to use it for a time series graduate
course AND i have a mac. I know tinn-R is a great text editor for R that
works on Windows but is there anything comparable to it for a Mac? I have
read multiple threads and my current findings are that there is really
nothing like tinn-R for a mac and that TextMate comes close (but
unfortunately this costs), some have said that they like the internal editor
as well. I would like to use a more "user-friendly" editor, if possible, and
I've been searching for hours now trying to figure out what to download and
start learning, until I stumbled upon this mailing list and was wondering if
someone could guide me and tell me what would be the most feasible option
for an editor and save me some time:)

Thank you so much,
k

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