A new little OpenCPU app allows you to knit and markdown in the browser.
It has a fancy pants code editor which automatically updates the output after 3 seconds of inactivity.
It uses the Ace web editor with
mode-r.js (thanks to RStudio for making the latter available).
#install the package library(devtools) install_github("markdownapp", "opencpu") #open it in opencpu library(opencpu) opencpu$browse("/library/markdownapp/www")