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Apache Cordova - Platform for building native mobile applications using HTML, CSS and JavaScript
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.
Kurogo Mobile Platform - Modo Labs empowers anyone to create workplace, university or hospital mobile apps, no technical skills required.
Quark.io - Software sketchbook for node projects.