There are many IDE's (Integrated Development Environments) for R.  So it is up to each developer to choose what's most important.  My personal favorite is Eclipse (see the wikipedia article).  Eclipse was originally created for Java development, but has become one of the most widely adopted IDE's for all languages at this stage thanks to it's architecture, which allows to easy extension through plugins.  For instance, Insightful created a new S-Plus GUI using Eclipse (which they call the S+ Workbench).

I show how to set up and use Eclipse for R development.

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Developer Tools · Intermediate