What documentation exists for R?

Chapter 5: R Add-On Packages 60
sudoku Sudoku puzzle solver.
supclust Methodology for supervised grouping of predictor variables.
superpc Supervised principal components.
survBayes Fits a proportional hazards model to time to event data by a Bayesian approach.
surveillance
Outbreak detection algorithms for surveillance data.
survey Summary statistics, generalized linear models, and general maximum likelihood
estimation for stratified, cluster-sampled, unequally weighted survey samples.
survival Functions for survival analysis, including penalised likelihood. Recommended.
survrec Survival analysis for recurrent event data.
svcR A support vector machine technique for clustering.
svcm 2d and 3d Space-Varying Coefficient Models.
svmpath Computes the entire regularization path for the two-class svm classifier with
essentialy the same cost as a single SVM fit.
systemfit Contains functions for fitting simultaneous systems of equations using Ordinary
Least Sqaures (OLS), Two-Stage Least Squares (2SLS), and Three-Stage Least
Squares (3SLS).
tapiR Tools for accessing (UK) parliamentary information in R.
taskPR Task-Parallel R package.
tcltk2 A series of widgets and functions to supplement tcltk.
tdist Computes the distribution of a linear combination of independent Student’s t
variables.
tdm A tool for Therapeutic Drug Monitoring.
tdthap Transmission/disequilibrium tests for extended marker haplotypes.
tensor Tensor product of arrays.
tensorA Advanced tensors arithmetic with named indices.
tgp Bayesian regression and adaptive sampling with Treed Gaussian Process models.
time Time tracking for developers.
titan Titration analysis for mass spectrometry data.
titecrm TIme-To-Event Continual Reassessment Method and calibration tools.
tkrplot Simple mechanism for placing R graphics in a Tk widget.
tlnise Two-level normal independent sampling estimation.
triangle Standard distribution functions for the triangle distribution.
tree Classification and regression trees.