r programming: Graphical User Interfaces for R

Brodgar - commercial software designed for biologists
rggobi^[9], an interface to GGobi for matrices visualization
Java Gui for R - based on Java
latticist - A graphical user interface for exploratory visualisation
playwith - A GTK+ graphical user interface for editing and interacting with R plots
pmg (Poor Man's GUI) - based on GTK+2
Rattle^[10] (the R Analytical Tool to Learn Easily) - based on GTK+2 (also offers a set of PMML exporters)
R Commander - based on tcltk (several plug-ins to Rcmdr are also available)
R Extension for MediaWiki - interactive and collaborative R web interface based on MediaWiki
RExcel - Using R and Rcmdr from within Microsoft Excel. More information at the rcom project server
RKWard - based on the KDE libraries
Sage - web browser interface as well as rpy support
SciViews-R - based on tcltk2
SciViews-K - based on Komodo Edit
Statistical Lab
nexusBPM - Automation Tool for R, eclipse plug-in to create R process flows and run R in parallel
StatET - R with Eclipse