noise.sh - Excel for music producers and sound designers
Stickman Builder - Free parametric graphic Stickman Builder, creates fascinating stick figures on the fly.
Composer's Sketchpad - A doodle-y iPad sequencer for making quick musical sketches
Iceberger - Draw an iceberg and see how it will float
Helio - Design successful products by revealing key user behaviors
Clipnote Studio - PC alternative to Nintendo's now defunct animation software, Flipnote studio