DeployR is a server-based framework that provides simple, secure R integration for application developers. It's available in two editions: DeployR Open, which is free and open-source; and Revolution R Enterprise DeployR, which adds a scalable grid framework and enterprise authentication features for production applications integrated with R.
If you're looking for an overview of what DeployR is and how you can use it to access R from other applications, we've just released a new white paper, Using DeployR to Solve the R Integration Problem. This 14-page document steps you through the basic DeployR workflow: the R user creates an script and publishes it to the server; an application developer links to the R script via the DeployR API; and an application user sees some results of an R calculation in a desktop, mobile or web-based application (most likely without being aware that R was involved at all).
You can download the whitepaper (free registration required) from the Whitepapers section of the Revolution Analytics website. For the technically-minded, you may also want to explore the DeployR Application Developer Documentation. You can also check out the list of our other most popular white papers and webinars on R, data science and big data analytics.
Revolution Analytics White Papers: Using DeployR to Solve the R Integration Problem