We make regular use of the following tools and/or software in our curriculum:

• Software 
  • Greenfoot (Game/Simulation Java Programming Environment, Windows/Mac/Linux)
  • Inkscape (Vector Graphics Editor, Windows/Mac/Linux)
    • Fix to run Inkscape Version 0.46 on Leopard
    • Or download the 0.47 Beta from the link above
  • Scratch (Game/Simulation Visual Programming Environment, Windows/Mac)
• Games
  • Fluxx
  • Grow-A-Game (downloadable/printable version of cards)

Other tools we've found useful:

• Pixen (Raster Image Editor, also does simple animation - Mac Only)