Z26 - Z26 is one of the best emulators for the Atari 2600.
Microsoft Visual Studio - Microsoft Visual Studio is an integrated development environment (IDE) from Microsoft.
jGameBase - jGameBase is a fully-featured retro-gaming emulator frontend and game database utility.
Visual Studio Code - Build and debug modern web and cloud applications, by Microsoft
WinUAE - WinUAE is a Windows port of the emulator UAE.
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.