The American's don't send any apprentice carpenters to the WorldSkills Carpentry Competition, So I added a new android app on Google Play.

Rafter Bevel Angles v 1.0
REQUIRES ANDROID:2.3.3 and up
https://play.google.com/store/apps/details?id=com.raftertools.bevelangles

This rafter calculator app is for the WorldSkills Carpentry Competition training. With this app the carpenter can verify their geometric layout method while using the traditional layout geometry. It has seat lip cut angles at the hip rafter for all of different types of rotated rafters as well as Hexenschnitt Gratsparren. Coupe de pied de noue, avec dévers inegaux.

All bevel angles are referenced from the traditional layout method used by the French and Germans carpenters. Use with the French Rabattement de Surface method (folding roof surface) or the German Flachenklappung method. Basiswissen Schiften or Charpente Les Traces.

Jack Rafter Plumb To Earth Bevel Angles.
Jack Rafter Plumb To Earth Offset Bevel Angles.
Jack Rafter Plumb To Roof Surface Offset Bevel Angles.
Rafter Plumb To Earth Offset Bevel Angles.
Crossing Jack Rafters Plumb To Roof Surface Bevel Angles.
Saint Andre Cross Rafters Plumb To Roof Surface Bevel Angles.
Purlin Rafter Plumb To Roof Surface Bevel Angles
Witches Cut on Hip Rafter with Square Tail Rafters
Hip Rafter Edge Bevel Angles, Backing Angles
Devers De Pas for Jack Rafters Plumb To Roof Surface

Traditional French and German Roof Framing Geometry Layout Books
Developing a construction plan in which each piece of wood can be found in its true shape.
http://sbebuilders.blogspot.com/2013/04/rafter-bevel-angles-for-worldskills.html