Afaik only RINO wallet supports multi-sig at the moment, but there are some privacy trade-offs with it since it's a light wallet. Some websites like XMRBazaar and MoneroMarket have multi-sigs for trades.
xmrsigner was revived recently and making progress, but is not out yet and still being developed:
https://monero.observer/diosdelrayo-ccs-proposal-offline-signing-library-xmrsigner/