28
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.
Zettlr does this reasonably well. It doesn't do it by default, though, you have to turn it on in the settings