Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Netbeans - NetBeans IDE 7.0. Develop desktop, mobile and web applications with Java, PHP, C/C++ and more. Runs on Windows, Linux, Mac OS X and Solaris. NetBeans IDE is open-source and free.
MIT App Inventor - App Inventor is a cloud-based tool, which means you can create apps for phones or tablets right in your web browser.
Orwell Dev-C - The official site of the Bloodshed Dev-C++ update, which is fully portable, and optionally ships with a 64bit compiler.
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.
C4droid - C4droid is an intelligent IDE and C/C++ compiler, allowing you to create your own application on Android devices.