| base | Base Package |
| class | Functions for Classification |
| compiler | Compiler Package |
| datasets | Datasets Package |
| graphics | Graphics Package |
| grDevices | Graphics Devices and Support for Colours and Fonts |
| grid | The Grid Graphics Package |
| Matrix | Sparse and Dense Matrix Classes and Methods |
| methods | Formal Methods and Classes |
| parallel | Support for Parallel computation |
| stats | Stats Package |
| tools | Tools for Package Development |
| utils | Utils Package |