Hi @Hristo_Velev! We don’t have a direct integration on radar, although internally we’ve been playing around with tools like IFTTT and Zapier in conjunction with the upcoming webhooks feature to prototype some workflows. If you have security considerations that have driven you to an internally hosted chat solution though, those may not be applicable.
Like @johnny.duguid said, there was a posting on the dev list about an open source slack integration, which may be something you could use to integrate with a different chat system. The Shotgun side of that implementation would be reusable against another chat system as long as it offers an API similar enough to Slack.