Notion

With Notion, you can write, plan, collaborate, and organize your life in a simple yet powerful way. With access to components such as databases, kanban boards, calendars or reminders, you can create your own systems, or you can explore a growing amount of free and premium templates that will enable you to get right into business. We at Lumen use it for project management, data organization and note taking, to just name a few.

Notion is free for personal use, but costs $4/month if you need unlimited guests on your files, more than 5MB of file uploads or 30 day version history, while a Team collaborative workspace starts from $8/member/month.