Zettlr is a Markdown editor that focuses on all the things one needs to write texts. It offers inline previews, citeproc support, easy exporting to all formats (even slideshows), syntax highlighting for many languages, and is cross-platform.
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Pro Focuses on writers
While many Markdown editors don't offer specific support for a certain type of workflow, or offer features for scientific workflows only, Zettlr offers features that help the writing process of journalists or researchers in the arts and humanities. It's a lot more text-focused than most editors.
Pro citation support
while it supports many syntax (chart, easy image insert, etc.) found in other editors, the great citation support made it possible to write real articles. Citation from Zotero and Mendeley can be inserted easily which is a huge plus
Pro Renders math in-place through KaTex
Pro Almost perfect!
After testing more than 30 alternatives, paid and free, I can definitely say that this is the best option, still not perfect, there are some bugs like creating / editing tables and resizing images, but the PROS destroy the CONS, easy quotes, WYSIWYM , attachments tab (supports attaching and opening links to any file), table of contents, TAGs, easy hyperlink between files (same as citations), export to many formats (like Word, HTML5, PDF)...