Stenmark.

Stenmark is your markdown librarian: a GTK4 Markdown reader, organizer and editor built with libadwaita. It features a split-pane editor with live preview, syntax highlighting, table of contents navigation, and a folder-based document browser.

Features:

• Live preview with synchronized scrolling
• CodeMirror 6 editor with Markdown syntax highlighting
• Folder-based document sidebar with pinning support
• Code block syntax highlighting with copy button
• Interactive task list checkboxes
• Table of contents navigation
• Light and dark theme support