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.
GitHub Visualizer - Enter user/repo and see the project visually
Markdown to PDF - Super simple way to get your markdown files to PDF
Gource - Gource is a software version control visualization tool.
UnMarkDocs - Unleash the Power of Markdown to Write Better Product Documentation
CodeFlower - CodeFlower visualizes source code repositories using an interactive tree.