| bufio | Package bufio implements buffered I/O. It wraps an io.Reader or io.Writer object, creating another object (Reader or Writer) that also implements the interface but provides buffering and some help for textual I/O. |
| bytes | Package bytes implements functions for the manipulation of byte slices. |
| compress/lzw | Package lzw implements the Lempel-Ziv-Welch compressed data format, described in T. A. Welch, “A Technique for High-Performance Data Compression”, Computer, 17(6) (June 1984), pp 8-19. |
| errors | Package errors implements functions to manipulate errors. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| image | Package image implements a basic 2-D image library. |
| image/color | Package color implements a basic color library. |
| image/color/palette | Package palette provides standard color palettes. |
| image/draw | Package draw provides image composition functions. |
| internal/byteorder | Package byteorder provides functions for decoding and encoding little and big endian integer types from/to byte slices. |
| io | Package io provides basic interfaces to I/O primitives. |
| math/bits | Package bits implements bit counting and manipulation functions for the predeclared unsigned integer types. |