| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| net/http | Package http provides HTTP client and server implementations. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| regexp | Package regexp implements regular expression search. |
| 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. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| time | Package time provides functionality for measuring and displaying time. |
| zgo.at/zhttp | |
| zgo.at/zhttp/internal/isatty | Package isatty implements interface to isatty |
| zgo.at/zlog | Package zlog is a logging library. |
| zgo.at/zstd/zdebug | Package zdebug implements functions useful when debugging programs. |
| zgo.at/zstd/znet | Package znet contains utilities for network communication. |