tutorial from rhino3d.co.jp (UDT)

The author try to express the creature with 3D digital modeling as possible. The creature is required much information to express its shape comparing with Inorganic substance like industrial products.
Advanced 3D deformation with Grasshopper

Introduce a blog “The Geometry of Bending”
You can read some interesting articles dealing with advanced deformation in Rhinoceros, including Grasshopper.
[via]creativetools
Download a Grasshopper tutorial

Woo Jae has been kind enough to share his expertise. Now you can download a grasshopper tutorial describing how to build up a structure in a parametric way.
[VIA]Creativetools
Download the manual for Grasshopper

[VIA]CreativeTools.se
Now, you can download a manual for Grasshopper from liftarchitects.com. It consists of 75 pages and gives a good introduction to grasshopper and how it working.
Click to Download Grasshopper manual.
Grasshopper Tutorial – Box Morphing-by baldino
Author: baldino
Box Morphing in Grasshopper. Part 1 – basics of the basics.
Box morphing allows you to transform geometry from a reference box (usually the bounding box of this geometry) into a target box, but this box can be, as it is covered in Part 2, a so-called twisted box, where the sides of the box are no longer parallel. In Part 3 and 4, we’ll se how we can use this technique to panel geometry on a surface.
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