Build your own Productivity App Suite (Notion-lite)

Combine a calendar, to-do list, and note-taking into a unified productivity web app. This project would help developers learn:

Full-stack app architecture (React + Node/Express or similar)

Data modeling (tasks, events, notes)

CRUD operations & local storage or database use

UI/UX design principles

Syncing, offline mode, and maybe even drag-and-drop features