| errors | Package errors implements functions to manipulate errors. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/boombuler/barcode | |
| github.com/boombuler/barcode/utils | Package utils contain some utilities which are needed to create barcodes |
| image | Package image implements a basic 2-D image library. |
| image/color | Package color implements a basic color library. |
| math | Package math provides basic constants and mathematical functions. |
| 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. |