Markly is a free, open-source Markdown editor for macOS that edits the .md files in folders you already have: no import, no database, no lock-in. Formatting renders as you type, and markers hide on lines you're not editing. Native SwiftUI + AppKit with Liquid Glass, no Electron. Format bar on selection, clickable tasks, one-click Git sync, focus mode, scroll-synced preview with math, HTML/PDF export. No accounts, no tracking.