- Free to download and open source
- Interactive programs using 2D, 3D or PDF output
- OpenGL integration for accelerated 3D
- For GNU/Linux, Mac OS X, and Windows
- Projects run online or as double-clickable applications
- Over 100 libraries extend the software into sound, video, computer vision, and more...
- Well documented, with many books available
Read Tutorial to develop Android App with Processing version 2.0+.
It's cross-post with Android-er.