Markdown is described as 'text-to-HTML conversion tool for web writers. Markdown allows you to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML (or HTML)' and is a very popular app in the Development category. There are more than 50 alternatives to Markdown for a variety of platforms, including Mac, Windows, Linux, Online / Web-based and iPhone.

Best Alternative : Joplin

|1|Joplin
Short Summary:
Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor.
|2|Typora
Short Summary:

Typora will give you a seamless experience as both a reader and a writer. It removes the preview window, mode switcher, syntax symbols of markdown source code, and all other unnecessary distractions.
|3|Zettler
Short Summary:

Zettlr is a supercharged markdown editor that combines many writing editor features and collect them in one application. It aims at speeding up your workflow and help you write without any interruptions.
|4|Mark Text
Short Summary:
Mark Text is a Markdown editor for Mac, Windows and Linux. It is a concise text editor, dedicated to improving your editing efficiency.

|5|ghost writer
Short Summary:
No excuses. No distractions. Just write. 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.

|6|Haroopad [DISCONTINUED]
Short Summary:
Haroopad is a markdown enabled document processor for creating web-friendly documents. You can author various formats of documents such as blog article, slide, presentation, report, and e-mail as if experts did.

|7|InkDrop
Short Summary:
The note-taking app with robust Markdown editor, supporting macOS, Windows, and Linux. This app is designed to be the most convenient way to make notes in Markdown for your daily hacking.

|8|Ginko
Short Summary:
Write and organize your ideas in Gingko tree documents. Whether building a business or writing a bestseller, Gingko lets your ideas flow naturally into place. Write, brainstorm, and organize your document, all in the same flow.

|9|ReText
Short Summary:
ReText is a simple text editor for Markdown and reStructuredText documents with syntax highlighting and optional live preview. It is written in Python using Qt libraries, able to run on any platforms (Linux and BSD are officially supported).

|10|Abricotine
Short Summary:
Abricotine is an open-source markdown editor for desktop. In Abricotine, you can preview your document directly in the text editor rather than in a side pane.