Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Knotable - Cut the noise out of busy email threads
Standard Notes - A safe place for your notes, thoughts, and life's work
Scrapbox - A new style of note-taking that lets you create, discuss, and learn together in one self-organizing space.
Startup Notes - Most actionable advice from each Startup School speaker
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.