Microsoft Visual Studio - Microsoft Visual Studio is an integrated development environment (IDE) from Microsoft.
ILSpy - ICSharpCode. Decompiler. Console..
IntelliJ IDEA - Capable and Ergonomic IDE for JVM
dnSpy - .NET assembly editor, decompiler, and debugger
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.
Java Decompiler - Yet another fast Java decompiler