Jot is a non-photorealistic renderer. You can now export to Jot from Blender.
Jot is a standalone WYSIWYG stylistic renderer that was developed back in 2002. It lets artists define the style of the outline used to render their models by simply drawing it, and it has a great system to get solid non-flickering outlines when the model is animated. I've written an exporter for Blender to get some renewed interest in Jot itself, and hopefully see talented developers willing to bring the technology of Jot into the future.
See ragnarb.com for a download link to both Jot, and the Blender exporter.
The image is of gabrielmda's model of David, rendered with Jot.