RStudio is described as 'Integrated development environment (IDE) for R. RStudio combines an intuitive user interface with powerful coding tools to help you get the most out of R' and is a very popular IDE in the development category. There are more than 50 alternatives to RStudio for a variety of platforms, including Windows, Linux, Mac, Web-based and Self-Hosted apps. The best RStudio alternative is Microsoft Visual Studio. It's not free, so if you're looking for a free alternative, you could try Microsoft Visual Studio or Jupyter. Other great apps like RStudio are RKWard, JASP, PSPP and Wolfram Language.
Revolution R is an alternative to R (although with a different licensing and OS support) and RStudio is an IDE that provides added functionality for both R and Revolution R. RStudio is dependent upon either R or any R derivative like Revolution R.