Directus - Free and Open-Source Headless CMS
Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
Graphy - Graphy is the tool for anyone who can teach & anything can be taught. From SMEs, Educators, Coaches, and Trainers to Professional associations & larger companies use Graphy.
Quadratic - Infinite canvas spreadsheet for data science with Python, SQL, and formulas.
Gantt - Create beautiful Gantt charts
Chat with Tesla - Can answer queries about science, inventions and more