| base | The R Base Package | 
| compiler | The R Compiler Package | 
| datasets | The R Datasets Package | 
| graphics | The R Graphics Package | 
| grDevices | The R Graphics Devices and Support for Colours and Fonts | 
| grid | The Grid Graphics Package | 
| methods | Formal Methods and Classes | 
| parallel | Support for Parallel computation in R | 
| splines | Regression Spline Functions and Classes | 
| stats | The R Stats Package | 
| stats4 | Statistical Functions using S4 Classes | 
| tcltk | Tcl/Tk Interface | 
| tools | Tools for Package Development | 
| utils | The R Utils Package |