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Markdown Editor with Obsidian-style Preview
(feddit.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Silverbullet is like that. It is not an electron or native app, you have to run a server and then get to it from the browser.
TLDR it is best run with docker or podman, but IMHO it is pretty good.