Discourse nowadays has a chat functionality. I haven’t generally enabled it, but it’s there if we want to. I know some people prefer the more direct chat, and I’m sure there are several Syncthing chat rooms on Discord, QQ, Slack, whatever, but we haven’t had anything “official” since the IRC channel on Freenode.
Obviously, hosting it ourselves in some form of official capacity means we are responsible for running it, in terms of moderation and spam control. I don’t think we can promise any kind of effective 24/7 moderation, but on the other hand this hasn’t been a real problem on the forum itself so far.
Using it would require an account, I believe even for viewing. It can also be limited by discourse “trust level”, but I suppose one point of having it would be to allow new users to ask questions so it would be counter productive to be too strict on that point.
Personally I find it tedious and frustrating in the extreme to debug and troubleshoot issues over live chat, but I could see the use for less on-topic chitchat.