Coburn

It's the familiar Metamask user interface just compatible with starknet. you can't switch between EVM compatible chains like you can with original Metamask though so it's strictly a Starknet wallet....

It uses the starkcurve so I think it wouldn't be much different than importing braavos or argent as a signer, but i don't know enough https://github.com/Consensys/starknet-snap/blob/main/packages/starknet-snap/src/utils/starknetUtils.ts