What I really need is realtime multi-party voice chat

Do any of these support that?

I mostly use discord for light coordination and online voice chat during games or activities.

Teamspeak, ventrilo, mumble - but discord replaced them all with being easy to use.

Sadly, there is no real alternative with all the discord features. I mean, you could create chats in Zoom and use their voice/video feature, but at least one person would need pro.