What are your favorite Slack Integrations for a launch and support?

tl;dr best slack integrations for indie-hacker/solo founder launching a saas.

I know that Slack is for "Team Messaging" but I would like to use it as a way to communicate with my customers and an information hub for my app, rather than having 10 tabs open. I assume others are doing this as well.

Any experience, advice, or comments are greatly appreciated e.g. "Google Calendar integration? YAGNI!"

I was scrolling through the integrations thought the following would be appropriate:

I am thinking for myself, the following integration

Google Calendar for events and appointments
Google analytics for my analytics
Stripe for dolla-dolla-bills yall
Sentry for error monitoring

what else? Pingdom, PagerDuty, Twitter? Indie Hackers slackbot to get replies to my IH posts?

Thanks IH!

Best,
Ted