The group I currently play with uses a group chat over SMS/MMS. But I’m going to be DMing a campaign with an open table, so I need something more persistent and flexible. I’ve used Discord in the past but IMHO it has way too many features.
What have you used to keep in touch with your players?
My club is old school and has a forum. It’s still work quite well at announcing new games, and tracking ongoing games.
When I GM, I post a reminder 2-3 days before the session, but try to set up campaign at fixed dates