Done. You have 2/3rds of Discord or Slack solved as just an insignificant fraction of my Private Cloud Project I just shared. Not interested in video or voice right now, it's easy to solve though. Also you'd have to solve for the mobile apps.
Edit: If you keep checking back, I'll have a video showing off that application. It's a bit beefy to just get up and running.
You go to person's profile. View their submissions. Use find via CTRL+F to seek out their "Show HN" submissions (or in this case, it's the top of the list because it's my last submission https://news.ycombinator.com/item?id=48970916 )