I'm currently using Google's chat and spaces at work. It's passable. They have a "threaded" view that I was really excited about at first but you can't collapse

I'm currently using Google's chat and spaces at work. It's passable. They have a "threaded" view that I was really excited about at first but you can't collapse the threads so people just reply to whatever the first thread is that they see. If they could get the UI right on the threaded bits and add a standalone desktop app, they'd be very close to "good enough" for most places that need some central chat option. I haven't tried out their web hooks yet, but it's on my experiment list. The rest of the Google Workspace offering just makes life so much easier though.