I find that I need an easy-to-use text communication tool for a small group of family members. In a past life, I would've just ponied up for a private forum subscription on Delphi or PBWorks and used that. Today I'm leaning towards Rocket.chat or Element.
We just need to be able to share information and files about an event. Any suggestions?
Trying to avoid anything touched by Facebook and other advertising companies. It may be impossible, though, given that it also needs to be fairly intuitive and easy to use.
Just trying to determine whether you just need a basic group messenger or actually need some team collab suite. Looks like you don't.
I personally like Session Messenger. It's originally forked from Signal, but doesn't require a phone number or any registration, so it's very simple from that perspective. Some good privacy/security to boot.
It supports groups and file sharing, although I've not tried file sharing in groups.
Signal, Telegram, Matrix and Discord are also popular.