Minimalist Markdown Editor

This is the simplest and slickest Markdown editor.

15 Alternatives To Minimalist Markdown Editor

Google Drive - Slides

Create a new presentation and edit it with others at the same time — from your computer, phone or tablet. Free with a Google account.
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LibreOffice - Writer

Open-source cross-platform word processor.

OneNote

Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.