Bulma - Bulma is an open source CSS framework based on Flexbox and built with Sass. It's 100% responsive, fully modular, and available for free.
Calmerry - Feel calm with online therapy
Milligram - A minimalist CSS framework
One-Minute Anxiety Helper - Digital coach to help in moments of stress and anxiety
Spectre.css - Lightweight, responsive and modern CSS framework for faster and extensible development.
Headspace - Meditation made simple. Brilliant things happen in calm minds.