Among the notable features:
- Syntax highlighting supporting GitHub flavor
- Live preview window + live sync navigation
- Smart indent+completion for list/blockquotes/tasklists
- High-DPI support
- Drag 'n drop of images supported
- Paste image from clipboard directly onto document
- Outlining/folding of code blocks
- Keyboard shortcuts
- Light Bulbs
- Brace completion with type-through
- Lightning fast
Plus more features to come: TOC navigation, format document (Markdown normalize) …etc.
Check it out!