Script written in R, a programming language used for statistical analysis and graphing purposes; contains code that can be executed within the R software environment; may contain commands that create objects (functions, values, etc.) and produce visualizations of the computed data.
I've been using Eclipse/StatET. 
However, there's a new FLOSS IDE that was released today that looks interesting called. It even supports Sweave, so once it becomes more polished I may switch. User input seemed a little sluggish when I played with it earlier today however.
Power Bi R Script Editor
Could someone please make me know if there is a nice script editor available under Mac, similar to Crimson, that offers R syntax highlighting (and pairs of parentheses underlining)? Thanks in advance. RStudio is an active member of the R community. We believe free and open source data analysis software is a foundation for innovative and important work in science, education, and industry. The many customers who value our professional software capabilities help us contribute to this community.
Update They have been actively updating RStudio every month or two. It's been months since I encountered even a minor bug. And the features added are really useful--seamless package development and native Git support being the two that come to mind. Emancipation of a teen in kansas.