Nearly three years ago, the team behind X.ai began researching and developing a smart personal assistant to help us schedule meetings and make sense of our calendars. Today, the company's dream is being realized as it moves out of beta and launches a professional version of its A.I.-powered assistant to the world. For 39 per month, you can schedule an unlimited number of meetings each month, while having access to VIP contacts and personalized signatures. If you're not familiar with X.ai, its main products are two "assistants" named Amy and Andrew that you communicate with through email. There's no app that needs to be downloaded -- you just include a special email address in all of your correspondence, asking the virtual assistant to find time on your calendar to set up a meeting with whomever you want. The company has a free plan that is capped at five meetings per month.