Interactive art and installation
Quartz Composer seems to be the most popular for now; it’s part of Xcode for Apple systems. You need a developer account and be logged in for the following link to work: https://developer.apple.com/downloads/index.action?name=quartz#
Here’s a good guide to Compositing with Quartz Composer.
Simple App Builders
There are a lot these apps out there so here are ones that I’ve seen students use.