Open Office repackaged for kids
http://wiki.ooo4kids.org/index.php/Main_Page
Have a file you don't know how to open? Think you need an expensive piece of software to open it? Chances are there is a great free program that's just as good as the expensive one, and you'll find it here.
http://www.openwith.org
turn any surface into an interactive whiteboard
http://www.uweschmidt.org/wiimote-whiteboard
Zu3D - brand new stop-motion animation software for Windows PCs .
http://www.zu3d.com
LMMS is a free cross-platform alternative to commercial programs like FL Studio®, which allow you to produce music with your computer.
http://lmms.sourceforge.net/home.php
The award-winning Sugar Learning Platform promotes collaborative learning through Sugar Activities that encourage critical thinking
http://www.sugarlabs.org
This is a free desktop App with more features than the Web based version
http://www.xtranormal.com/about_state
FluxTime Studio is free - you can create, edit and play your own animation clips, and send them as e-cards to friends and family.
http://www.fluxtime.com/index.php
Synfig is a powerful, industrial-strength vector-based 2D animation software package, designed from the ground-up for producing feature-film quality animation with fewer people and resources.
http://www.synfig.org/Main_Page
Consider greenfoot as a combination between a framework for creating two-dimensional grid assignments in Java and an integrated development environment (class browser, editor, compiler, execution, etc.) suitable for novice programmers.
http://www.greenfoot.org/
Storytelling Alice is a programming environment designed to motivate a broad spectrum of middle school students (particularly girls) to learn to program computers through creating short 3D animated movies.
http://www.alice.org/kelleher/storytelling/index.html
Celtx is the world's first all-in-one media pre-production software. It has everything you need to take your story from concept to production. Celtx replaces 'paper, pen & binder' pre-production with a digital approach
http://celtx.com/index.html
PianoBooster is a fun way of playing along with a musical accompaniment and at the same time learning the basics of reading musical notation.
http://pianobooster.sourceforge.net
free project management software
http://www.projectinabox.org.uk/default.asp
Shrink O'Matic is an AIR application to easily (batch) resize (shrink) images. It handles JPGs, GIFs and PNGs. Simply drag and drop images and they'll be resized as you wish!
http://toki-woki.net/p/Shrink-O-Matic