David Revoy works mostly as a digital artist doing illustrations. I find his work inspiring – both as an artist, and as an open source enthusiast.
He’s worked on three of the open movies produced by the Blender Foundation in their “Open Projects” – an attempt to make short feature films with 100% open source software.
He also spends a lot of time helping out the Krita and mypaint open source illustration/painting/drawing tools.