https://www.higifter.com/ It's an SMS-based chatbot that helps you remember special occasions (birthday, anniversary, mother's day), recommends gifts, and purchases them for you automatically.

Working on this with my girlfriend, mostly for fun and to learn something new. We're using Webflow for the site, Airtable as the backend, Zap to help stitch a few parts together, and Twilio for SMS support.