In the still/open workshop we are getting into the following open source apps:

arduino - The open-source Arduino environment makes it easy to write code and upload it to the i/o board. It runs on Windows, Mac OS X, and Linux. The environment is written in Java and based on Processing, avr-gcc, and other open source software.

processing - Processing is an open source programming language and environment for people who want to program images, animation, and interactions.