It is basically what it says on the tin. Since Substrate multisig addresses are deterministic, MultiSigil doesn't need to do any network connections — and can be used even before the chain has been started.
$ multi-sigil --help
multi-sigil 0.1.0
Parity Technologies <[email protected]>
CLI for generating Substrate multisig addresses
USAGE:
multi-sigil [OPTIONS] <THRESHOLD> <ADDRESSES>...
ARGS:
<THRESHOLD> The number of signatures needed to perform the operation
<ADDRESSES>... The addresses to use
FLAGS:
-h, --help Prints help information
-V, --version Prints version information
OPTIONS:
--network <NETWORK> Network to calculate multisig for; defaults to Kusama [default: kusama] [possible
values: kusama, polkadot]
Currently only Kusama and Polkadot are supported.
It should be fairly trivial to add support of other networks from the list of supported in SS58 — PRs are welcome!