• Fantastic contraption:  http://fantasticcontraption.com/
• Design your own font: http://fontstruct.fontshop.com/
  
• Create Fractals http://www.ablestable.com/play/applets/fractals/index.htm
• Play Chess http://www.ablestable.com/play/applets/chess/javachess.htm
• Play Bridges http://www.ablestable.com/play/applets/bridges/index.htm
• Play Sudoku http://www.websudoku.com/
• Play Travian http://www.travian.com/
• Play Viking Quest http://www.bbc.co.uk/history/ancient/vikings/launch_gms_viking_quest.shtml 
•  Make creatures and structures in a physics and engineering simulator  Soda Constructor
   

Need Installation of Free Software

Phun  - gamelike physics sandbox

Download from http://www.phunland.com/wiki/Download

Tutorials at http://www.phunland.com/wiki/Tutorials 

Google Sketch Up – create 3D designs and structures. 

Download from http://sketchup.google.com/

Tutorials at http://sketchup.google.com/training/videos.html

Westpoint Bridge Designer - design and test bridges

Download from http://bridgecontest.usma.edu/download.htm

Tutorial at http://bridgecontest.usma.edu/tutorial.htm

Pivot - make stick figure animations

Download from http://pbone.it-mate.co.uk/pivot.htm

Tutorial at http://www.instructables.com/id/Simple-FREE-Flash-Animation-Pivot-Animation

Submit a suggestion

If you know of other websites or free software that enables users to engage in constructive or creative activities, please email your suggestions to mmeijers at ictmindtools.net