If your team uses Slack and PagerDuty, you might be interested in [pd-oncall-chat-topic](https://github.com/PagerDuty/pd-oncall-chat-topic). It's an open source AWS Lambda bot that automatically updates your Slack channel topics with who is currently on-call.
We've recently added support for shift-based schedules (PagerDuty's new schedule type). Previously the bot only worked with the older style schedules and shift-based schedules would cause it to display spooky data.
Setup instructions are in the repo!