Lately I was pointed to http://opencpu.org/ . Nifty website, but after browsing for a little while I wasn't so sure where it is located in the R landscape compared to e.g. rApache or RPy2.
After waiting a long time for the server to come back I was finally able to read the architecture section, but that wasn't too comprehensive. I'm looking for a more detailed explanation of what OpenCPU is, how it is intended to be used, and how this compares with existing tools such as rApache and RPy2.