Geometer's SketchPad

http://www.dynamicgeometry.com/

Geometry Software

Google( Trimble) SketchUp 3-D Design Software ( PC/MAC)

• SketchUp is fast, fun and intuitive
• Visualize anything in 3D
• Share models with colleagues and friends

Bits from Bytes Axon-2 3D Printer Software(PC)

This tool converts your 3D drawing into ready-to-print files for Bits from Bytes printers. 

Inkscape Open-Source Vector Graphics Editor(PC)

An Open Source vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format.

Inkscape supports many advanced SVG features (markers, clones, alpha blending, etc.) and great care is taken in designing a streamlined interface. It is very easy to edit nodes, perform complex path operations, trace bitmaps and much more. We also aim to maintain a thriving user and developer community by using open, community-oriented development.

Solidworks CAD Software( PC)

SolidWorks offers the best suite of tools for engineering design, documentation, simulation, and sustainable design in one easy-to-learn software package.

AutoDesk 123D 3D Design Software

Make awesome stuff.

Flat is boring. Capture your world
in 3D with free Autodesk 123D apps 

Arduino Micro-Controllers and Software

Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software.

 It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments.

Origami TreeMaker  http://www.langorigami.com/science/computational/treemaker/treemaker.php

TreeMaker is a program for the design of origami bases. You draw a stick figure of the base on the screen; each stick in the stick figure (the "tree") will be represented by a flap on the base. You can also place various constraints on the flaps, forcing them to be corner, edge, or middle flaps, and/or setting up various symmetry relationships (forcing pairs of flaps to be symmetric about a line of symmetry of the paper, for example). Once you have defined the tree, TreeMaker computes the full crease pattern for a base which, when folded, will have a projection (roughly speaking, its "shadow") equivalent to that specified by the defining tree. The crease pattern can be printed out, or copied and pasted into another graphics program for further processing. Crease assignment (mountain or valley) are not computed, but with a few simple rules and some exploration by hand, the proper crease assignment can usually easily be found.

Fold-It- The Online Protein Folding Game

http://fold.it/portal/