Scuttlebutt clients on Mac include:

Full list of clients - https://scuttlebutt.nz/get-started/

Oasis - https://github.com/fraction/oasis-desktop

Patchwork - https://github.com/ssbc/patchwork

Manyverse (Android and iOS) - https://www.manyver.se/

Planetary (iOS) - https://www.planetary.social/

Clients include serving of content, but are completely different from hosting a Pub or Room.  Cheers.