Package flagenum is a utility package which facilitates implementation of flag.Value, json.Marshaler, and json.Unmarshaler interfaces via a string-to- value mapping.

Package multiflag is a package providing a flag.Value implementation capable of switching between multiple registered sub-flags, each of which have their own set of parameter flags.

Package stringlistflag provides a flag.Value implementation which resolves multiple args into a []string.

Package stringsetflag provides a flag.Value implementation which resolves multiple args into a stringset.