x.ai

x.ai automated meeting scheduling back in the mid-2010s — you'd CC its AI persona, Amy or Andrew, on an email thread and it handled the back-and-forth of finding a mutually available time. The company shut down in 2021, and its x.ai domain has since been taken over by Elon Musk's AI company xAI, which is an unrelated business that just happens to share the name — worth knowing if you're searching for one and land on the other.