MWC and Atomic swap with BTC-BCH-DOGE-LTC-ZEC-DASHAs of right now, the GUI wallets of MWC already support atomic swap with BTC and BCH (very easy and smooth users experience, you should try it). As far I'm aware, there will be soon support release for DOGE-LTC-ZEC-DASH-ETH-ERC20 stable coin and more... Personally, i would like to see the most is MWC/XMR, i'm trying to make it accepted by the community, it would be really nice among all others assets that will be already supported

By the way, there's already support for MWC/BTC Atomic Swap with segwit and multisig address.
If you are not familiar with atomic swap in general, it means that you can safely make OTC with someone without trusted third-party, it removes the need of escrow, exchanges etc for the prices you wish.
Atomic Swap Marketplace
A decentralized atomic swap marketplace is as well on the planning to reinforce the user experience on atomics swap, it will help to pool all the bids and asks, and let choose the users to have more offers or to look for a candidate in Atomics swap bids&asks channel.
Atomic swap wallet/guide
GUI MWC Wallets supporting Atomic Swap :
https://github.com/mwcproject/mwc-qt-wallet/releases Guide for atomic swap :
https://github.com/mwcproject/docs/wiki/Atomic-Swaps-using-the-QT-WalletDevelopers forum post
DOGE-LTC-ZEC-DASH :
https://forum.mwc.mw/t/k-progress-update-thread-2021-q1/75/6 ETH - ERC20 :
https://forum.mwc.mw/t/terry-progress-update-thread-feb-2021/90 Atomic Swap Marketplace details:
https://github.com/mwcproject/mwc-node/blob/master/doc/distribited_message_pool_and_applications.md#atomic-swap-marketplace