Turns Geany into a markdown editor by providing a preview pane in the sidebar to show the formatting of several light-weight languages as they are edited. Supported document types include AsciiDoc, DocBook, Fountain, HTML, LaTeX, Markdown, MediaWiki, reStructuredText, Textile, and Txt2Tags.
Why do you think that https://github.com/Linbreux/wikmd is a good alternative to geany-preview