| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| golang.org/x/image/math/fixed | Package fixed implements fixed-point integer types. |
| image | Package image implements a basic 2-D image library. |
| image/color | Package color implements a basic color library. |
| image/draw | Package draw provides image composition functions. |
| math | Package math provides basic constants and mathematical functions. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |