https://github.com/faiface/gui

Concurrent, minimal, GUI library. Uses GLFW under the hood.

https://github.com/atotto/clipboard

Clipboard library, supports xorg, wayland, macos, windows,

https://github.com/faiface/beep

Brings sound to any Go application.

https://github.com/hajimehoshi/oto

Lower level sound library.

https://github.com/mattn/go-isatty

Check if the current shell is interactive.

https://github.com/integrii/flaggy

Idiomatic Go input parsing with subcommands, positional values, and flags at any position. No required project or package layout and no external dependencies.

https://github.com/urfave/cli

The standard library flag package is very simple and minimal. For many projects it's all you'd ever need. However, if you need automatic man page generation, bash completions, or subcommands it's probably worth using an external library.