Microsoft Visual Studio - Microsoft Visual Studio is an integrated development environment (IDE) from Microsoft.
TabNotes - Markdown notepad in your new tab
Visual Studio Code - Build and debug modern web and cloud applications, by Microsoft
Typora - A minimal Markdown reading & writing app.
Xcode - Xcode is Apple’s powerful integrated development environment for creating great apps for Mac, iPhone, and iPad. Xcode 4 includes the Xcode IDE, instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs.
Markdown New Tab - Write notes in Markdown directly in the 'New Tab' page