QUANDEMAMA is an in browser Markdown editor. It allows you to type in the Markdown, and when you hit the convert button, it will show you the resulting html as both code, and as it would be seen in browser. I've integrated code highlighting into it with highlight.js and its a very useful tool for quick Markdown creation and notetaking.
Asepritely
Extensions in Lua for the Pixel Art Software, Aseprite

WikiPDF
A Datahoarders Dream, all the Wikipedia in PDF form.

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