Draftbit - Build mobile apps visually with Draftbit's pro-code, no-code platform. Source code included, of course.
Android Studio - Android development environment based on IntelliJ IDEA
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.
Codebots - Codebots is an AI-powered app building tool designed for people who aren’t classically trained in programming.
Adobe AIR - Adobe® AIR® runtime enables developers to package the same code into native apps for Windows and Mac OS desktops, iPhone, iPad, Kindle Fire, Nook Tablet & Android. Buy now.
Codename One - iOS, Android, Windows Phone native app development in Java.