| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/alecthomas/chroma | Package chroma takes source code and other structured text and converts it into syntax highlighted HTML, ANSI- coloured text, etc. |
| github.com/alecthomas/chroma/formatters/html | |
| io | Package io provides basic interfaces to I/O primitives. |
| math | Package math provides basic constants and mathematical functions. |
| sort | Package sort provides primitives for sorting slices and user-defined collections. |