Diagram Drawing Software

I want a program (preferably free) to draw geometric patterns (both simple and complex) in MS Word. I search the Web, but in vain.

Geometer's Sketchpad is good. Not so free, but I do not think it's too expensive. You can draw in and copy and paste your pictures in MS Word.

A free software from Wingeom peanut. It is not as good as Geometer's Sketchpad, but it will do the trick. Jump to ... http://math.exeter.edu/rparris/wingeom.h wingeom and download. Unzip it and its ready to use.

Check in google images

matlab use!
it is very easy to use ..
use the trace ezplot linear equations

Drawit is not free, but it is cheap. 20 days free trial, registration is $ 20.