In response to my last post, a few teachers have sent me suggestions for additional free software packages they use in the classroom.
LEGO Digital Designer 1.6
http://ldd.lego.com/
...a free virtual building system available for both the Windows and Mac OSX platform
Google SketchUp
http://sketchup.google.com/
...a powerful 3-D modeling program avaiable for Windows 2000 and better and Mac OS10.3.9 and better; can be used in conjunction with Google Earth or on its own
TuxPaint
http://www.newbreedsoftware.com/tuxpaint/
...an easy-to-use drawing program available for Windows and Mac OSX
Kathy Schrock
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