Basecamp seems like a good alternative. I can't stand Slack for anything, really. Email is OK, but you can't easily just add someone into a group of old emails

Basecamp seems like a good alternative. I can't stand Slack for anything, really. Email is OK, but you can't easily just add someone into a group of old emails automatically. Well, I suppose you could, based on your email service, but yeah. I think this kind of thing is where Basecamp and similar tools really shine.