Madoko is described as 'fast markdown processor for writing professional articles, books, manuals, webpages and presentations, with a focus on simplicity and plain text readability'. There are more than 50 alternatives to Madoko for a variety of platforms, including Mac, Windows, Linux, Online / Web-based and Self-Hosted solutions. The best alternative is Joplin. It's not free, so if you're looking for a free alternative, you could try Typora or Mark Text. Other great apps like Madoko are StackEdit (Free, Open Source), Haroopad (Free, Open Source), HackMD (Freemium) and Inkdrop (Paid).
#Markdown is a efficient markdown editor for OS X, iPhone and iPad. ##Features: live preview, sync scroll, auto save, powerful actions, custom themes and CSS, HTML export,math, enhanced CJK support and more.