[Fnoord]

Did you check Franz/Ferdi? Though its Electron, it does support a lot of protocols.

People here (NL) barely use iMessage. They use WhatsApp mainly. I prefer (and do use mainly) Signal. For group chat, Matrix. Though Discord is (unfortunately) very popular. I dig it only for gaming.

[tentacleuno]

Doesn't Ferdi just put everything into an embedded browser and call it a day? I may be wrong here as I used it for a brief stint, but that is basically what I picked up from it.