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LibreOffice - Writer - Open-source cross-platform word processor.
draw.io - Online diagramming application
Microsoft Word - Microsoft Word is a commercial word document processor for Windows.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
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.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.