GoGo Board -Open source hardware platform for programable projects using sensors and robotics. Works with MicroWorlds and Scratch.
Pico Cricket – A programmable tiny robotics construction kit that can make things spin, light up, and play music.
Sugru – Air-curing rubber used to repair and affix things.
Tinkercad – Kid-friendly, free and Web-based CAD program that may be used with 3D printers.
Inkscape – 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. This is useful for CAD and 3D printing tasks.
Places to purchase parts and supplies
Sparkfun -Online supply house for hobbyist electronics
Adafruit – Online supplier of “Unique and Fun DIY Electronics and Kits”
Digikey – Extensive collection of electronic components