What documentation exists for R?

Chapter 5: R Add-On Packages 64
RGtkBindingGenerator
A meta-package which generates C and R code to provide bindings to a Gtkbased
library.
RGtkExtra
RGtkGlade
A collection of S functions that provide an interface to the widgets in the
gtk+extra library such as the GtkSheet data-grid display, icon list, file list and
directory tree.
S language bindings providing an interface to Glade, the interactive Gnome
GUI creator.
RGtkHTML
A collection of S functions that provide an interface to creating and controlling
an HTML widget which can be used to display HTML documents from files or
content generated dynamically in S.
RGtkIPrimitives
A collection of low-level primitives for interactive use with R graphics and the
gtkDevice using RGtk.
RGtkViewers
A collection of tools for viewing different S objects, databases, class and widget
hierarchies, S source file contents, etc.
RJavaDevice
A graphics device for R that uses Java components and graphics. APIs.
RMatlab A bi-directional interface between R and Matlab.
RObjectTables
The C and S code allows one to define R objects to be used as elements of
the search path with their own semantics and facilities for reading and writing
variables. The objects implement a simple interface via R functions (either
methods or closures) and can access external data, e.g., in other applications,
languages, formats, . . .
RSMethods
An implementation of S version 4 methods and classes for R, consistent with
the basic material in “Programming with Data” by John M. Chambers, 1998,
Springer NY.
RSPerl An interface from R to an embedded, persistent Perl interpreter, allowing one
to call arbitrary Perl subroutines, classes and methods.
RSPython Allows Python programs to invoke S functions, methods, etc., and S code to
call Python functionality.
RXLisp An interface to call XLisp-Stat functions from within R.
Rcompression
In-memory decompression for GNU zip and bzip2 formats.
Rlibstree Suffix Trees in R via the libstree C library.