NotePlan - Make plans inside an individual markdown note for every day in your calendar. Use it as a journal for your daily tasks and plan todos in advance. For Mac, iPhone and iPad.
Markdeep - Advanced Markdown renderer for the browser with full diagram support
markdown to web - Convert markdown to online web page
Landslide - landslide - Generate HTML5 slideshows from markdown, ReST, or textile.
Mochi - Write notes and flashcards with Markdown and study them with spaced repetition.
Markdown-it - High-speed Markdown parser with 100% CommonMark support, extensions & syntax plugins.