Smalltalk (Score 1)

Smalltalk - it was originally built for kids.

And it's used in those situations where other development environments fail to manage complexity.

Alan Kay ('I invented the term Object Oriented') gives a nice demonstration of Squeak Smalltalk from a child's perspective in his famous talk The Computer Revolution Hasn't Happened Yet; spool forward to minute 48 for the Squeak demo.

For Smalltalk info start browsing at www.smalltalk.org.