I look at your website and have exactly zero idea what it is. You start with Why. Don't start with why, start with what! WHAT IS IT!? Is it like Slack but self

I look at your website and have exactly zero idea what it is. You start with Why. Don't start with why, start with what! WHAT IS IT!? Is it like Slack but self hosted? I need screenshots. Are there companion apps? Show me.