WikiTribune - Evidence based journalism, from the founder of Wikipedia
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.
Neighborhoods.nyc - Hyper-local alerts targeted by NYC neighborhood
markdown to web - Convert markdown to online web page
Data Dashboard by Wikimedia Foundation - Compiled data of the Worlds busiest public site
Mochi - Write notes and flashcards with Markdown and study them with spaced repetition.