I work as part of a fully remote team and I can't really imagine not using Slack.
Generally we discuss in Slack, immortalize in GitHub issues (using ZenHub, thank god), and do ad-hoc video calls for screen sharing and whatnot. Announcements and such usually go out as an email blast.
I'm really curious what life would be like using email/issue comments only. Obviously this must be possible since so many open source projects operate this way, right? But they also have a totally different organizational structure.
Any insights, HN?