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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.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
Joplin has this functionality, although I don’t often use it since I prefer to type directly into the Markdown editor. Whatever you choose, be sure that you’re comfortable with the security and privacy implications of it.