The software listed below is all FREE, and will run on a variety of computers, Mac and PC. Go to alice.org to see a fantastic 3D authoring program. Click on "downloads" to get started. Wonderful tutorial ! RobotProg: Program a robot to do your bidding ! Download at: http://www.physicsbox.com/indexrobotprogen.html Lego Digital Designer Download at: http://ldd.lego.com/download/default.aspx Tux Type, Typing program Download from: http://tuxtype.sourceforge.net/download/ Scratch    Computer Programming for kids: this was developed by the lego team headed by Mitch Resnick and Seymour Papert(now of Blue Hill, Maine) Download at:    http://scratch.mit.edu/ StarLogo, also from MIT.  Program the turtle. Model an epidemic. RunAway Bunny. Download at  http://education.mit.edu/drupal/starlogo-tng Interactive Physics:  I've used this on line with 2nd graders. They enjoy the circuit construction kit, projectile motion, and the skateboarder. Have them eplain to you some of the terms used. http://phet.colorado.edu/simulations/    We're using Tux Math with some classes. It's a great drill program, and requires some fast thinking! Download at:     http://sourceforge.net/projects/tuxmath/ Stellaruim is an astronomy program.  This free software is used by the Fairbanks Planetarium,St Johnsbury, VT. See screen shots:   http://stellarium.org/screenshots.html Download page :      http://stellarium.org/ Get Miro: Download video from a variety of sources, and keep the video for off line viewing.                                 http://www.getmiro.com/