| bytes | Package bytes implements functions for the manipulation of byte slices. |
| errors | Package errors implements functions to manipulate errors. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| golang.org/x/image/font | Package font defines an interface for font faces, for drawing text on an image. |
| 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. |
| log | Package log implements a simple logging package. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |