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.
Unity - The multiplatform game creation tools for everyone.
Orwell Dev-C - The official site of the Bloodshed Dev-C++ update, which is fully portable, and optionally ships with a 64bit compiler.
Godot Engine - Feature-packed 2D and 3D open source game engine.
CppDroid - CppDroid is simple C/C++ IDE focused on learning programming languages and libraries. Features:
Blender - Blender is the open source, cross platform suite of tools for 3D creation.