Adds a new control to Blender that allows you to adjust normals by stroking your model with a brush.
This addon is also available from its Github webpage:
It's only been a few days, but version 1.1.6 is out already. The tool now has support for undo/redo. Also added is the ability to use stylus pressure to adjust the strength of your stroke, as well as the ability to 'comb' normals and have them point in the direction of your brush stroke.