Advanced Toon Shader – Extending Blender Internal
In the light of recent events, BNPR is glad to report that NPR artists aren’t second rated in Blender community and Blender development.
Vertex Normal Editing
Abnormal add-on | Doc
NPR Render Engine
BEER Backend: Malt | Doc
BEER UI
Post process line renderer
Freestyle UI Upgrade
Tips & Tricks: NPR Wiki
Must read: NPR 101