Markdown (md) and reStructuredText (rst) editor

Try ReText:

Description-en: Simple text editor for Markdown and reStructuredText

ReText is a simple editor for Markdown and reStructuredText markup languages.

ReText supports tabs, live text preview and syntax highlighting.

Supported export formats: HTML, ODT, PDF. It is also possible to write custom export extensions. It is written in Python using Qt libraries.

From apt-cache show retext.

Install it with:

sudo apt-get install retext

Typora is a true WYSIWYG markdown editor. Editing in Typora is WYSIWYG, and you can also edit the document's source code directly too. Typora can save documents in both Markdown (.md) and reStructuredText (.rst) as well as several other formats. Typora supports images, headers, lists, tables, code fences, mathematics, diagrams, inline styles, etc.

What makes Typora special is its ability to capture rich content from local applications and webpages directly via copy/paste without losing any of the original formatting and convert it directly into markdown. Typora can capture in this way formatted lists, headings, formatted text, hyperlinks, and images. Typora can also capture some formatted tables depending on how they are formatted,

Typora can be installed from the Ubuntu Software app in all currently supported versions of Ubuntu or from the terminal with the following command:

sudo snap install typora-alanzanattadev