Untools - Hand-picked tools for better thinking
LibreOffice - Writer - Open-source cross-platform word processor.
Super Thinking - The big book of mental models
Microsoft Word - Microsoft Word is a commercial word document processor for Windows.
Notionery - Mental models made for Notion
Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.