Appcelerator Titanium - Appcelerator Open Source
Qt Creator - Qt Creator is a cross-platform C++, JavaScript and QML integrated development environment. It is the fastest, easiest and most fun experience a C++ developer could wish for.
B4X - Cross platform development tools for native iOS, Android, desktop and server applications.
Apache Cordova - Platform for building native mobile applications using HTML, CSS and JavaScript
Sencha Touch - The leading mobile web app framework based on HTML5 for amazing mobile apps.
appdeck - AppDeck is a hybrid app building engine that allows the mobile app developers to create premiums mobile applications.