| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| golang.org/x/text/language | Package language implements BCP 47 language tags and related functionality. |
| golang.org/x/text/message | Package message implements formatted I/O for localized strings with functions analogous to the fmt's print functions. |
| golang.org/x/text/number | Package number formats numbers according to the customs of different locales. |
| html | Package html provides functions for escaping and unescaping HTML text. |
| html/template | Package template (html/template) implements data-driven templates for generating HTML output safe against code injection. |
| io/fs | Package fs defines basic interfaces to a file system. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| reflect | Package reflect implements run-time reflection, allowing a program to manipulate objects with arbitrary types. |
| 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. |
| time | Package time provides functionality for measuring and displaying time. |
| zgo.at/errors | Package errors adds some useful error helpers. |
| zgo.at/z18n/msgfile | Package msgfile manages message files. |
| zgo.at/z18n/plural | Package plural provides support for pluralizing messages according to CLDR rules http://cldr.unicode.org/index/cldr-spec/plural-rules |
| zgo.at/zstd/zstring | Package zstring implements functions for strings. |