Notion

Notion is a flexible, freemium, collaborative online workspace for project and task management. With a robust collection of free and paid templates, you can make project timelines, manage your personal task lists, organize your notes, author wikis, build databases, and assign content to specific collaborators. Different views of this data can be assembled for customized dashboards, displays and trackers, and use can be as simple as filling in template blocks or as complex as linking databases and formulas for calculations. You can also use the built in AI features to support building and using these tools, and plugins from 3rd party sites to add even more functionality.