You love Slack. Your team loves Slack. You've integrated other services like Github or Trello into Slack, but there is one little thing you wish Slack could do and there is no integration for it. It's time to build a Slack bot.
Ruby/Sinatra running on Heroku (Hobby Dyno: $7/month) • Takes MINUTES as a variable. Default is 30 minutes • Uses “FreeBusy” Google Calendar API method • Returns an array of calendars that are open for the duration requested • Plain text response is sent back to Slack