Microsoft Visual Studio - Microsoft Visual Studio is an integrated development environment (IDE) from Microsoft.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
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.
Beyond Compare - Beyond Compare allows you to compare files and folders.
VS Code - Build and debug modern web and cloud applications, by Microsoft
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.