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.

mdbook - Gitbook alternative in Rust

Markdown to PDF - Super simple way to get your markdown files to PDF

MkDocs - Project documentation with Markdown.

UnMarkDocs - Unleash the Power of Markdown to Write Better Product Documentation

GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.