Caret

Caret is an editor for the Markdown markup language. It provides a clean modern interface with code auto-complete, context menu actions (fix spelling, check tasks, visit links, etc.), and code editing help (tables, lists, HTML, fences, links, emphasis, etc.).

Its sidebar helps you work with files and headings. It lets you filter, preview, move, rename, and delete files, open files in tabs, quickly switch from one file to the next, view the headings in the current file, etc.