I'm part of the Hack Club community Slack [1] and managed to get myself into over 700 channels. Then the ping overload was very much starting to get to me (especially since channel managers can do @channel pings in their channels!), so I built this tool to mass-leave channels in the terminal. Amongst other things, it allows sorting by 'last read' times, filtering out private channels, searching channels, and much more.

[1] https://hackclub.com/slack