| base | The R Base Package | 
| boot | Bootstrap Functions (Originally by Angelo Canty for S) | 
| class | Functions for Classification | 
| cluster | "Finding Groups in Data": Cluster Analysis Extended Rousseeuw et
al. | 
| codetools | Code Analysis Tools for R | 
| compiler | The R Compiler Package | 
| datasets | The R Datasets Package | 
| foreign | Read Data Stored by 'Minitab', 'S', 'SAS', 'SPSS', 'Stata',
'Systat', 'Weka', 'dBase', ... | 
| graphics | The R Graphics Package | 
| grDevices | The R Graphics Devices and Support for Colours and Fonts | 
| grid | The Grid Graphics Package | 
| KernSmooth | Functions for Kernel Smoothing Supporting Wand & Jones (1995) | 
| lattice | Trellis Graphics for R | 
| MASS | Support Functions and Datasets for Venables and Ripley's MASS | 
| Matrix | Sparse and Dense Matrix Classes and Methods | 
| methods | Formal Methods and Classes | 
| mgcv | Mixed GAM Computation Vehicle with Automatic Smoothness
Estimation | 
| nlme | Linear and Nonlinear Mixed Effects Models | 
| nnet | Feed-Forward Neural Networks and Multinomial Log-Linear Models | 
| parallel | Support for Parallel computation in R | 
| rpart | Recursive Partitioning and Regression Trees | 
| spatial | Functions for Kriging and Point Pattern Analysis | 
| splines | Regression Spline Functions and Classes | 
| stats | The R Stats Package | 
| stats4 | Statistical Functions using S4 Classes | 
| survival | Survival Analysis | 
| tcltk | Tcl/Tk Interface | 
| tools | Tools for Package Development | 
| utils | The R Utils Package |