Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Sampulator - Make (and record) beats on your keyboard
Sculptris - Sculptris: Enter a world of digital art without barriers.
Tinkersynth - Create and purchase unique generative art
Misfit Model 3D - Misfit Model 3D is a 3D model editor that basically operates with triangle-based models.
Splice Beat Maker - Make and share beats in your browser