| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/bep/logg | package logg implements a simple structured logging API. |
| github.com/fatih/color | Package color is an ANSI color package to output colorized or SGR defined output to the standard output. |
| github.com/mattn/go-colorable | |
| io | Package io provides basic interfaces to I/O primitives. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |