for programming, I ran across
age ~7
http://scratch.mit.edu
age 10-13
http://www.alice.org/
14+
http://www.greenfoot.org
Where is the few best sources to find and get updated on educational software and sites such as the above, though not necessarily for programming.
In case someone here is highly experienced with the Web, please take care with what you post -- only top-notch quality source for educational software/sites.