I maintain an open-source project with a few corporate sponsors. As part of their sponsorship, companies get Slack-based support. Shared channels have made this

I maintain an open-source project with a few corporate sponsors. As part of their sponsorship, companies get Slack-based support. Shared channels have made this process incredibly easy. Since they already use Slack, I just create a shared channel in my organization and invite them. They get to decide who is in the channel. Even if you get added later, you can see the whole chat history. It's extremely valuable for doing cross-organization work.