I’m looking for a community management tool I could #selfhosting

Our Club try to move from Mail to messanger as communication tool.

Our userbase use Whatsapp, #Threema, #Signal
The usage is not regulated and not all boardmembers use all tools or wish to do that.

Could someone recommens selfhosting tools for that. I woukd host it on my #Docker
At moment I only have #Zammad on my list. But it could not use Threema and is not exactly for community management.

@selfhosted