The best alternatives to Volón are Notepin, Gooba, and Markdown Preview. If these 3 options don't work for you, we've listed a few more alternatives below.
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Universal-2 by AssemblyAI— Speech-to-Text API for conversational data
Markdown Editor is a modern, open-source and developer friendly WYSIWYG editor, which features a web version and a native standalone version for mac,windows and linux os.