Apps similar to Marker include Typora. It's paid, but ghostwriter and MarkText are free. Other options are Apostrophe, ReText, Blank - A new writing-experience and Buho. In total there are nine Note-taking Tools like Marker for Linux, Mac, Windows and Android.
A minimalist Markdown editor offering cross-platform synchronization, live preview, and seamless export/import in various formats like PDF, DOCX, and LaTeX. Features include distraction-free Focus and Typewriter modes, file management with tree and articles panels, and content organization through an outline panel.
China
ghostwriter is a feature-rich text editor using Markdown syntax which makes it suitable for note-taking, document redaction, simple HTML website creation and much more.
Germany
EU
Open-source Markdown editor on Mac, Windows, and Linux offering real-time preview, clean interface, and various themes. Supports math expressions, exports HTML/PDF, allows image pasting, and more.
Singapore
Apostrophe is a simple GNU/Linux Markdown editor built with the GTK+ framework.
United States
ReText is a simple text editor for Markdown and reStructuredText documents with syntax highlighting and optional live preview.
Blank is a minimalistic, opinionated markdown editor made for writing. It works purely keyboard-based. Its minimalistic UI and WYSIWYG helps you stay focused on what really matters: content. Save to markdown or export your files to PDF.
Buho is a note-taking app. Buho will let you take quick notes, save links, create books and pages for taking classes notes.
Mexico
A fully featured markdown editor for Linux. Features include Live Preview, PDF/HTML export, MathJax support, Syntax highlighting, customizable, keyboard shortcuts, GFM, images, tables and much more.
A Markdown editor with syntax highlighting and live preview.
