Hi All,
Grasshopper is a plugin for the 3d Modelling software Rhino. It turns a rather ordinary modeling software into something quite extraordinary.
If you are interested in doing large buildings like sports stadiums, airports and hi-rise buildings then you really need to know how to use it.
Take a look at this post: http://blog.rhino3d.com/2016/04/are-you-architect.html
You'll get a sense of its formal and analytical capabilities.
Regards
Russell