I am a big fan of jEdit (www.jedit.org). It is easy to customize text
editor able to do syntax highlights of 100's of text file formats, including
*.R and *.Rd files. I also can be modified by many user developed extension
packages.
Jarek
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Jarek Tuszynski, PhD. o / \
Science Applications International Corporation <\__,|
(703) 676-4192 "> \
Jaroslaw.W.Tuszynski at saic.com ` \